### EXAM GUIDELINES P1

## Electric Circuits

**(This section must be read in conjunction with the CAPS, p. 88–89 & 121.) **
### Ohm's Law

**State** Ohm's law in words:

The potential difference across a conductor is directly
proportional to the current in the conductor at constant temperature.
**Determine** the relationship between current, potential difference and resistance at
constant temperature using a simple circuit.
**State** the **difference** between **ohmic conductors**** and
** **non-ohmic conductors** and give an
example of each.
**Solve** problems using:

for series and parallel circuits (maximum four resistors).

### Power, Energy

**Define** *power* as the rate at which work is done.
**Solve** problems using:

**Solve** problems using:

**Solve** circuit problems involving the concepts of power and electrical energy.
**Deduce** that the **kilowatt hour (kWh)** refers to the use of
**1 kilowatt of electricity for
1 hour**.
**Calculate** the cost of electricity usage given the power specifications of the appliances
used, the duration and the cost of 1 kWh.

### Internal resistance, series and parallel networks

**Solve** problems involving current, voltage and resistance for circuits containing
arrangements of resistors in series and in parallel (maximum four resistors).
**Explain** the term **internal resistance**.
- Solve circuit problems using:

**Solve** circuit problems, with internal resistance, involving series-parallel networks of
resistors (maximum four resistors).