| E (Energy) | QV (Charge x Voltage) |
| Q (Charge) | IT (Currant x Time) |
| V (Voltage) With EMF and currant and resistance | EMF - IR (Electro motive force - (Currant x Resistance))
For the output of a battery with internal resistance |
| 1 J (Joule) | 6.2x10^18 eV (Electron volts) |
| V (Voltage) With currant and Resistance | IR (Currant x Resistance) |
| P (Power) (Using curant, voltage and resistance) | IV = I^2R = V^2/R (Currant x Voltage = Currant^2 x Resistance = Voltage^2
/ Resistance |
| Force with power and velocity | F = p / v
Force = power / velocity |
| Efficiency | Useful power output / total power input |
| Energy with voltage currant and resistance | E = V +Ir
Energy = voltage + currant x resistance |
| p.d with work done and charge | V = W / Q
voltage = work done / charge |
| Definition of a volt | 1 joule per coulomb |
| Resistivity | R x A / L
resistance x cross sectional area / length |
| Total resistance in series | Rt = R1 + R2 + R3 |
| Total resistance in parallel | 1/Rt = 1/R1 + 1/R2 + 1/R3 |
| Energy transferred by a component | E = I x t x V
Energy transferred = Current x time x voltage |
| Definition of emf | Amount of energy supplied per coulomb by a power source |
| Emf equation | Emf = I x (R+r)
Emf = currant x (resistance in circuit + internal resistance) |
| Emf with voltage, currant and internal resistance | Emf = V + Ir
Emf = voltage + current x internal resistance |
| What happens to currant in series | Same through every component |
| What happens to currant in parallel | The currant changes per branch depending how much resistance there is |
| What happens to voltage in series | The voltage is split between all components and the total is equal to the amount of voltage produced by the source |
| What happens to voltage in parallel | It is the same as the voltage produced by the source |
| What does a capacitor do | A device that stores electrical charge, it has two plates a positive and a negative plate |
| Charge with voltage and capacitance | Q = CV |
| Currant with voltage capacitance and time | I = VC/t |
| Energy stored on a capacitor | E = 1/2 x QV |
