Electricity – GCSE AQA Foundation Combined Science Physics revision notes

Electricity covers Current, potential difference and resistance, Series and parallel circuits, Domestic uses and safety, and Energy transfers in GCSE AQA Foundation Combined Science Physics. 22 lessons in 4 subtopics.

Key circuit symbols include the battery and cell (long and short lines), resistor (rectangle), variable resistor (rectangle with an arrow through it), open switch (gap in line), lamp (circle with an X inside), motor (circle with M) and power supply (circle with + and - signs). The Circuit Symbols and Diagrams notes cover this in full.

Potential difference (V) is the energy transferred per unit charge between two points in a circuit, measured in volts (V). The Current, Potential Difference and Resistance notes cover this in full.

The circuit symbol for a variable resistor is a rectangle with an arrow through it. The Circuit Symbols and Diagrams notes cover this in full.

Ohm's Law connects potential difference, current and resistance: V = IR. The Current, Potential Difference and Resistance notes cover this in full.

Electric current is the rate of flow of electrical charge through a conductor, measured in amperes (A). The Electric Charge and Current notes cover this in full.

Resistance is calculated with R = V ÷ I, giving ohms when volts are divided by amperes. The Measuring Resistance and Ohmic Conductors notes cover this in full.

To convert milliamps to amps, divide by 1000, because a milliamp (mA) is one thousandth of an amp: 500 mA equals 0.5 A and 250 mA equals 0.25 A. The Calculating Voltage, Current, and Resistance notes cover this in full.

The National Grid is a system of cables and transformers linking power stations to consumers across the country. The National Grid Introduction notes cover this in full.