physics as: electricity

what is potential difference?

energy transferred/work done per unit charge

what is electromotive force?

energy transferred/work done per unit charge by the energy source

what is current?

rate of flow of charge

what is a coulomb?

the amount of charge that flows in one second when the current is 1A

what is power?

rate of energy transfer

what is resistivity?

the resisting ability of a specific material

equation linking energy and voltage

E = QV

equation linking power and voltage

P = V² / R

equation linking power and current

P = I² R

equation linking energy, voltage, current, time

E = VIt

equation linking power and energy

E = Pt

describe the IV graph of an ohmic resistor

1. Current is directly proportional to voltage AT A CONSTANT TEMPERATURE

2. This shows that resistance is constant at a constant temperature because the gradient is constant

3. The steeper the gradient, the lower the resistance

describe the IV graph of a filament bulb

1. non-linear relationship between current and voltage

2. gradient decreases, showing that the resistivity of the material increases

3. curve levels off at the end

4. this is because: as voltage increases, temperature in the bulb increases too, and the cations vibrate more and collide with electrons more often, making it harder for current to flow