P2-Electricity-Everyday elecricity
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10 Terms
What is mains electricity?
AC supplywith a frequency of 50Hz and a voltage of 230Hz
What is alternating current?
Current that varies from positive to negative, chnaging direction
What is direct current?
Movement of charge in one direction only, supplied by cells and batteries
What is the live wire
(brown) carries alternating potential difference at 230V
What is the neutral wire?
(blue) completes the circuit at 0V
What is the earth wire?
(green and yellow striped) Carries current only if there is a fault, connected to the earth
What is power?
Energy transferred per second, dorectly proportionate to current and voltage
What does the power rating of an appliance represent?
Indicates power used in watts, greater power ratiing mean more energy usage
What is the national grid?
A system of cables and transformers linking power stations to consumers in the UK.
What is a transformer?