What is the current in a series circuit?
The same at all points.
R total in a series circuit =
R1 + R2 + R…
What is the current in a parallel circuit?
I = I1 + I2 + I…
What is the p.d across components in a parallel circuit?
The same.
What is R total in parallel circuit =
1/ R total = 1 / R1 + 1 / R2 + 1 /R…
Power is defined as what?
The rate of energy transfer. It is measured in watts, where 1 watt is equal to 1 joule per second.
P =
P = IV P = Itv P = I^2 R P = V^2 / R
What happens to charge as it goes round a circuit?
Charge is conserved. It doesn’t get used up or lost.
The total current entering a junction =
The total current leaving it
The total emf around a series circuit =
The sum of the p.d.s across each component.