9.2 Electricity

Question 1

9.2.1 Define potential difference:

Answer 1

Voltage is the energy transferred per unit charge across a component.

Question 2

9.2.2 What is the relationship between Voltage, Work done, and Charge, and add units:

Answer 2

Voltage = Work done / Charge
V = W/C
voltage in volts (V)
Work done in joules (J)
Charge in Coulombs (C)

Question 3

9.2.3 Recall 3 equations for Power using Current, Voltage and Resistance, and add units:

Answer 3

P = IV
P=I^2 * R
P = V^2 / R

I = Current in (A)
R = Resistance in (Ω)
V = Voltage in (V)

due to V=IR