physics unit 4(domestic electricity)
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23 Terms
what dose the rain main circuit consisted of
3 wires, live neutral and earth
what dose the live wire do
Carries current into the house at a high voltage
What dose the neutral wire do
Completes the circuit and has the same current as the live wire but lower voltage, it take it away from the plug and out of the circuit
what dose the earth wire do
Operating normally it has no urrent, but it is connect to the casing of and device with a metal and if the live wire touches the casing due to a fault then the current will travel safely to the earth through the earth instead through a person touching the casing
what type of circuit is a ring main circuit
Parallel
what dose a fuse do
Stops the current if it becomes to large
Preventing the device overheating
explain how a fuse works
When the current becomes to large it melts a wire in the fuse, this means the fuse has blown. It must be replace after this
what dose a minicture circuit break (MCB) do
Stops the current if it become to large. To prevent overheating
what are the advantages of a minicture circuit breaker (MCB)
Reacts more quickly and can be reset
how dose a minicture circuit breaker(MCB) work
When the current great to large it heats up this causes a switch to flip
what dose a residual current circuit breaker (RCCB) do
Stops the current if the current in the neutral wire is diffrent to the live wire. Protecting users from serious electric shock
how do a residual current circuit breaker work
When the the current is inturupted it trips a switch
what are the advantages to an RCCB
Reacts to very small differences
Reacts very quickly
Can be reset
what are the 2 ways eletricity can be supplied
Alternating current(AC) and direct current (DC)
what supplies alternating current
National grid
how do alternating current work
Voltage constantly chahanges size and the current constantly change direction
what supplies direct current
Battery’s
how dose direct current work
Voltage and current have constant size and direction
what dose the graph for alternating current look like
A line going up and down with trophs over the time line
what dose the graph for direct current look like
A straight flat line
what is the amount of enregy used in a home measured in
Kilowatt hours (KwH)
what is 1 kwh equal to
The energy converted by a 1kw device fro 1 hour
how do efficenys srateing helps us
They can tell us the cost of use