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| Question | Answer |
| If we have a wire carring a current I, then the total amount of charge will depend on I and T | Equation: ΔQ I = Δt |
| The unit of current: Ampere (A) (The current when one coulomb of charge flows each second) | One coulomb is the amount of charge on 6.25x10^18 |
| The amount of energy supplied to each unit of charge is called the electromotive force! (emf) | 1V = 1JC^-1 |
| Potential difference has the same units as 'emf', and the definition of P.D,V, As work done: | V=W/Q |
| Resistance, if we know the current and P.d, can be calculated: | With the equation: R=V/I |
| Resistance is measured in ohms. The symbol for an ohm looks like this: Ω | Ohm's law: I = V/R |
| Resistance of a conductor: Required: Length (L), Cross-sectional area (A), resistivity(p) | Equation: R=pl/A |
| Power and work in electric circuits: | P(power) = VI Work done = W = VxIxt |
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