Generic Electrical

What is a volt?

Volt or voltage is a measure of the force or pressure that pushes electric charges through a circuit. A higher voltage means that there is a greater force pushing the charges, which can result in a higher current flow.

What is an ohm?

An ohm is a unit of electrical resistance, and it is denoted by the symbol “Ω”. One ohm is defined as the amount of resistance that will allow one ampere of current to flow through a circuit when one volt of potential difference is applied across the circuit.

What is capacitance?

Capacitance is the ability of a system to store an electric charge. A capacitor is a device that is used to store electrical energy in an electric field. Capacitance is measured in farads (F).

What is an Ampere?

Ampere is a measure of the rate at which electric charges flow through a circuit and it is denoted by the symbol “A”.

What is fault current?

Fault current is the electric current that flows through an electrical system during a fault condition, which is an abnormal situation that can occur when there is a short circuit or an earth fault. In a short circuit, the current flows outside the intended path, which can cause damage to the equipment or result in a fire. In an earth fault, the current flows through the earth, which can also cause damage and may pose a safety hazard.

What are transformers?

Transformers are electrical devices that are used to transfer electrical energy from one circuit to another by means of electromagnetic induction. They are commonly used in power distribution systems to step-up or step-down the voltage of the electricity as it travels from power plants to consumers.

What is the definition of low voltage, medium voltage, high voltage, and extra high voltage?

Low voltage (LV): Typically refers to electrical systems that operate at voltages up to 1,000 volts alternating current (AC) or 1,500 volts direct current (DC). This is the voltage level used in homes and small commercial buildings for lighting, appliances, and other low-power electrical equipment.

Medium voltage (MV): Generally refers to electrical systems that operate at voltages between 1,000- and 35,000-volts AC or 1,500- and 46,000-volts DC. This is the voltage level used in larger commercial buildings, industrial facilities, and some small power generation systems.

High voltage (HV): Usually refers to electrical systems that operate at voltages above 35,000 volts AC or 46,000 volts DC. This is the voltage level used in large industrial facilities, power transmission and distribution systems, and some high-power generation systems.

Extra high voltage (EHV): Generally refers to electrical systems that operate at voltages above 230,000 volts AC. This is the voltage level used in long-distance power transmissions systems, such as those used to transmit power between different regions or countries.

What is voltage rating?

Voltage rating refers to the maximum voltage that a device or electrical system is designed to safely operate at. It is typically expressed in volts and is an important parameter to consider when selecting and using electrical equipment.

General FAQs

Who are Stortech and what do you do?

Stortech specialises in sourcing a comprehensive range of electronic components from manufacturers worldwide. Customers benefit from our wide-ranging technical knowledge and extensive experience in sourcing products-particularly from the Far East and Asia, where we have established strong business relationships.

Many of the items we supply are specially designed to meet individual requirements and/or are industry specific.

Our customers often ask us to source a diverse range of other products on their behalf, from Motors and Hoist controls to equipment bags and cases. If you can’t find what you are looking for, please contact our sales team.

How can I contact your company?

Call our free phone: + 44 (0) 1279 451100

For CCTV queries: +44 (0 )1279 419913

Email us:

For all sales:

What are your business hours?

Monday:  8:30 – 17:00

Tuesday: 8:30 – 17:00

Wednesday: 8:30 – 17:00

Thursday: 8:30 – 17:00

Friday: 8:30 – 17:00

Saturday: Closed

Sunday: Closed

How long will it take to receive my order?

Stortech offer many different shipping methods, we direct shipments to defined customer locations by offering:

  • Same day despatch
  • Express next working day deliveries
  • Timed service shipments
  • Same day shipments
  • Consolidated shipments

What is your privacy policy?

You can find all information regarding our privacy policy here:

Do you offer customer support or technical assistance?

If you have any issues or queries regarding a product, please get in touch with us today and we can get one of our experts to help with any technical queries or order queries.


What is a CCTV camera, and how does it work?

A CCTV (Closed-Circuit Television) camera is a type of video camera that is used for surveillance and security purposes. It is designed to capture and record video footage of a specific area or space, which can then be viewed live or later.

The basic components of a CCTV camera system include the camera itself, a recording device (such as a digital video recorder or DVR), and a display monitor. The camera captures video footage and sends it to the recording device for storage. The display monitor allows the footage to be viewed in real-time or played back later.

CCTV cameras can be analogue or digital. Analog cameras send video signals over coaxial cables to a recording device, whereas digital cameras send video signals over an IP network. In recent years, IP (Internet Protocol) cameras have become increasingly popular due to their high resolution and advanced features such as motion detection and remote access.

CCTV cameras can be set up for a variety of purposes, including monitoring public spaces, securing businesses and homes, and improving traffic safety. They can also be used in conjunction with other security measures, such as alarms and access control systems. Overall, CCTV cameras provide an effective way to deter criminal activity, improve safety, and provide valuable evidence in the event of an incident.

Can CCTV cameras be installed outside?

Yes, CCTV cameras can be installed outside. In fact, outdoor surveillance is one of the most common uses of CCTV cameras. Outdoor CCTV cameras are typically designed to be weatherproof and able to withstand various environmental conditions such as rain, wind, and temperature extremes.

All our micro-dome cameras are IP rated and are fitted externally on buses, coaches and trams all over the UK.

What is the difference between analogue and IP CCTV cameras?

The main difference between analogue and IP (Internet Protocol) CCTV cameras is in the way they transmit video signals.

Analog CCTV cameras send video signals in analogue format over coaxial cables to a digital video recorder (DVR) for recording. Analog cameras are typically less expensive than IP cameras, but they offer lower resolution and less flexibility in terms of remote access and integration with other systems.

IP CCTV cameras, on the other hand, send video signals in digital format over an IP network to a network video recorder (NVR) for recording. IP cameras can capture high-resolution images and offer more advanced features such as remote access and analytics. They also allow for easier integration with other network-based systems, such as access control and alarm systems.

In terms of installation, IP cameras can be more complex to install than analogue cameras, as they require networking expertise to set up and configure. However, once installed, IP cameras can be easier to maintain and expand, as additional cameras can be added to the network without the need for additional cabling.

Overall, the choice between analogue and IP CCTV cameras depends on factors such as budget, resolution requirements, and system integration needs. While analogue cameras may be suitable for smaller installations with lower resolution requirements, IP cameras offer more advanced features and scalability for larger, more complex installations.

Can CCTV cameras be used for facial recognition?

Yes, CCTV cameras can be used for facial recognition technology to identify individuals based on their unique facial features. This technology has applications in law enforcement, security, and access control.

What are the benefits of installing CCTV cameras on public transport?

There are several benefits to installing CCTV cameras on public transport, including:

Deterrence: CCTV cameras can deter criminal activity, including vandalism, theft, and assault, by providing a visible reminder that the area is being monitored.

Safety: CCTV cameras can help to improve the safety of passengers and staff by providing a visual record of any incidents that occur on the transport system. This can help to identify and respond to emergencies more quickly.

Evidence: CCTV footage can provide valuable evidence in the event of an incident, such as a crime or accident. This can assist with investigations and improve the chances of identifying and prosecuting perpetrators.

Operational efficiency: CCTV cameras can help to improve the efficiency of transport systems by monitoring passenger flow and identifying potential bottlenecks or areas of congestion. This can help to optimize transport schedules and reduce delays.

Customer confidence: The presence of CCTV cameras can help to improve customer confidence in the safety and security of the transport system, leading to increased ridership and revenue.

Overall, the installation of CCTV cameras on public transport can help to improve safety, reduce crime, and increase operational efficiency, making for a more secure and reliable transport system.

How many CCTV cameras are typically installed on buses/trains/trams?

The number of CCTV cameras installed on buses, trains, and trams can vary depending on a range of factors, including the size of the vehicle and the specific requirements of the transport system.

On average, buses typically have between two and four CCTV cameras installed, with one camera located near the driver to monitor the front of the bus and others located at strategic points throughout the vehicle. Trams and trains tend to have more cameras installed, with up to 16 cameras on larger trains and trams.

The number of cameras required on a transport vehicle is determined by factors such as the size of the vehicle, the number of passengers, and the specific security and safety requirements of the transport system. In some cases, transport operators may also install additional cameras in areas such as depots or stations to provide extra security and monitoring.

It’s worth noting that the number of CCTV cameras installed on public transport may also be subject to local laws and regulations, which may specify minimum or maximum requirements for video surveillance.

Can transport CCTV cameras help prevent crime?

Yes, transport CCTV cameras can help prevent crime. CCTV (closed-circuit television) cameras are used for surveillance and monitoring, and they can be useful tools in reducing and preventing crime in public transport systems.

One of the main benefits of transport CCTV cameras is that they act as a deterrent to potential offenders. Knowing that they are being watched can discourage criminals from committing crimes such as theft, vandalism, and assault. CCTV cameras can also help identify perpetrators after a crime has been committed, which can aid in their arrest and prosecution.

In addition, transport CCTV cameras can be used to improve public safety by enabling operators to monitor for potential safety hazards, such as passengers behaving erratically or suspicious packages left unattended. This can help transport operators take proactive measures to prevent accidents or security incidents before they occur.

However, it’s important to note that the effectiveness of CCTV cameras in preventing crime is not absolute. While CCTV cameras can be an effective tool, they are not a complete solution on their own. Other factors, such as increased police presence, improved lighting, and better community engagement, also play an important role in reducing crime.

How is the footage from transport CCTV cameras stored?

Transport CCTV footage is typically stored on digital video recorders or network video recorders, which are equipped with hard drives capable of storing large amounts of data. Modern transport CCTV systems often use IP cameras connected to a network, allowing for greater flexibility in managing and accessing the footage. Cloud-based storage solutions may also be used. Compliance with privacy laws and regulations is necessary, with rules governing how long footage can be stored, who has access to it, and how it can be used depending on the jurisdiction.

How long is transport CCTV footage typically kept for?

The length of time transport CCTV footage is kept depends on the transport operator and local regulations. It can vary from a few days to several months or even up to a year or more. Different retention policies may be used for different types of footage, and storage capacity may also influence how long footage is kept.

What is the warranty of your CCTV cameras?

All of our cameras come with 1 years warranty from the original shipping date.

Can your micro-dome cameras be customised?

Our micro-dome cameras can be customised to suit your requirements, we can offer customisations on material, colour, and lens size. For any other customisations or queries, call our CCTV sales team who can assist +44 (0 )1279 419913

Have a question or project you would like to discuss with one of our experts?

Get in touch today

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