Students will be able to
- recall that ohms are the unit of electrical resistance,
- use in all permutations,
- state how the current through an ohmic conductor varies with potential difference across it,
- state how the current through a filament bulb varies with potential difference across it,
- state how the current through a diode varies with potential difference across it,
- identify an ohmic conductor from a graph of its current and potential difference characteristics,
- state how the resistance of an LDR varies with light incident upon it,
- state how the resistance of a thermistor varies with temperature.
Students should already be familiar with
- what electric charge is,
- what electric current is,
- the units of charge and current,
- the circuit symbols for a cell, a battery, a resistor, a bulb, a diode, an LED, an LDR, a thermistor, and a variable resistor.
Students will not cover
- parallel circuits,
- any kind of non-direct current,
- Kirchhoff’s laws.