Equations for Electricity in the Home Flashcards
Power, energy and time
P=E/t
Power, voltage and current
P=IV
Voltage, current and resistance
V=IR
Power, current and resistance
P=I^2 r
Energy, voltage and charge
E=VQ
Charge, current and time
Q=IT
How does the circuit run?
Through the live, into the fuse, and completing the circuit through the neutral
What does the earth wire do
If a part of the circuit touches the plug, it would make the whole appliance live; however, the earth wire stops this from happening by grounding the charge
What does a plug need to have to not need an earth wire
Plastic Casing
Double insulation
What are the different amp values in fuses?
3A, 5A, 13A
How does a trip switch work
When too much current passes through an appliance, the switch is ‘tripped’ and the circuit is broken
How do you get shocked?
Large potential difference produced around body, current flows through body and is grounded
Exampls of ac
Mains
Example of dc
Batteries
What is the difference between ac and dc
Ac changes direction constantly and is produced by an alternating voltage, whereas dc always flows in the same direction and is produced by a direct voltage
