Electricity - Electricity in the home

17 important questions on Electricity - Electricity in the home

What is the domestic electrical system?

A network electrical wiring runs through the walls and ceilings of a home.

What is U1, U2, U3?

These are voltages across the first, second and third branches in volts(V)

What is a group switch?

A switch that lets you turn the voltage off for the for all the sockets and light fittings in a group in one go.
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What is the formula of I total?

I total=I1+I2+I3+....

What is the voltage of a live wire?

230 V

What is a switch wire?

A black wire that goes from the switch to the light

What is the formula for calculating the electrical power?

P=U*I

What is a kWh meter or an energy meter?

A meter that can measure the consumption of electrical energy in a house

Which formula belongs to kWh?

E=P*T
p in kilowatt
t in hour

What happens when short-circuiting is happening?

The insulation of an appliance or wire fails. It lets the current take a different path with much less resistence.

What is body resistance?

The resistance of your body against electrical currents.

What is contact resistance?

The resistance at the points where the current enters and exits the body

What is a group fuse?

A device that turns the current off if the current in the group goes above 16A

What is a circuit breaker?

An electronic fuse. When the circuit breaker turns the current off, a small lever flips up

What is double insulation?

A way of insulating appliances in which two layers of insulation are used: one around the components that the current is passing through and one on the outside of the appliance

What are earth leakage circuit breakers?

A device that compares the current in the live wire against the current in the neutral wire. If the difference is greater than 30 mA, it will turn off the power

What is an earth wire?

A wire with a green-and-yellow striped insulation that connects that socket's earth connection to a pin that has been driven into the ground

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