P5(Electricity In The Home) Flashcards
What is alternating current
Current that changes direction
What is Direct current
Current that flows in one direction only
What is the live wire, earth wire and neutral wire
Live wire= the wire that carries the electrical current
Neutral wire= the wire which has a neutral charge
Earth wire= the wire that earths the metal case of a mains appliance
What colour is the live, earth and neutral wire
Live=brown
neutral= blue
Earth= green and yellow
What do step up transformers do
-Increases voltage
-decreases current
-energy lost as heat decreases
What do step down transformers do
-Decreases voltage
-Produces current needed for consumers
-makes voltage safe for consumers
What is power
The energy transferred to a device each second
What is the formula that relates power, energy and time
What is the formula that relates power, current and potential difference
What is the formula that relates power , current and resistance
What is the formula for efficiency
What is the formula that relates power voltage and resistance
What is the formula that relates energy,voltage,current and time
