| A | B |
|---|
| resistor |  |
| two cell battery |  |
| four cell battery |  |
| voltmeter |  |
| series circuit |  |
| parallel circuit |  |
| ammeter |  |
| lamp |  |
| unit for charge (Q) | coulomb (C) |
| unit for voltage (V) | volt (V) |
| unit for power (P) | watt (W) |
| unit for energy (E) | joule (J) |
| unit for resistance (R) | ohm (omega) |
| Q= | I x t |
| unit for time (t) | seconds (s) |
| P = | I x V |
| E = | P x t |
| two resistors in series | R(total) = R1 + R2 |
| two resistors in parallel | 1/R(total) = 1/R1 + 1/R2 |
| 1 kw h = | 3.6 MJ |
| current entering junction = | current leaving junction |
| voltage drops and rises around a loop = | 0 |
| current is | the rate of flow of charges |
| voltage is a measure of | the energy given to or taken from charges |
| resistance of a device is a measure of | the difficulty charges have in passing through it |
| one kW h is | the energy used by a 1 kW device left on for one hour |
| in a series circuit | everything has the same current through it |
| in a parallel circuit | current splits up at junctions |
| an ammeter measures the | current |
| a voltmeter measures | energy gains and losses of charges between two points |
| wires in a circuit | do not transform any energy |
| a perfect ammeter | has zero resistance |
| in a perfect voltmeter | no current flows through it |
| 1 amp is equal to | 1000 mA (milliamps) |
| 1 kV is equal to | 1000 V (volts) |
| 1 MJ (megajoule) ia equal to | 1 000 000 J (joules) |
| 1 kilohm is equal to | 1000 ohms |
| in a cell | chemical energy is transformed to electrical energy |
| in a resistor | electrical energy is transformed to thermal energy |
| in a light globe | electrical energy is transformed to light and thermal energies |
