and resistance are calculated using the current or resistance when given using the current and linked. equation: the other two values. potential difference? Equation linking State the correct SI units for Why does increasing the potential each quantity (potential potential difference in a difference, current difference, current and circuit also increase the and resistance resistance). current? should be known. potential difference, V, in How does the type of metal used What is meant by resistance? How to find the volts, V for a wire affect its resistance? resistance of current, I, in amperes, A Find the resistance of some Why do expensive leads electrical electrical components using components by have gold plating on them? resistance, R, in ohms, Ω current and potential experiment. Explain the design and use What factors affect the difference readings. of a circuit to measure the resistance of a length of resistance of a component Required practical: wire? by measuring the current Use circuit diagrams to set up Draw a circuit that can be used through, and potential and check appropriate to find the resistance of an difference across, the electrical component a circuits to investigate the component. voltmeter and an ammeter. factors affecting the resistance of electrical Students should set up and circuits. This should include: use a circuit to investigate a the length of a wire at factor/ the factors that affect • the resistance of an constant temperature electrical component(s). combinations of resistors in • series and parallel (10.2.15).
and resistance are linked. Equation linking potential difference, current and resistance should be known. How to find the resistance of electrical components by experiment. calculated using the equation: potential difference, V, in volts, V current, I, in amperes, A resistance, R, in ohms, Ω Explain the design and use of a circuit to measure the resistance of a component by measuring the current through, and potential difference across, the component. Students should set up and use a circuit to investigate a factor/ the factors that affect the resistance of an electrical component(s). current or resistance when given the other two values. State the correct SI units for each quantity (potential difference, current and resistance). How does the type of metal used for a wire affect its resistance? Why do expensive leads have gold plating on them? What factors affect the resistance of a length of wire? Draw a circuit that can be used to find the resistance of an electrical component a voltmeter and an ammeter. using the current and potential difference? Why does increasing the potential difference in a circuit also increase the current? What is meant by resistance? Find the resistance of some electrical components using current and potential difference readings. Required practical: Use circuit diagrams to set up and check appropriate circuits to investigate the factors affecting the resistance of electrical circuits. This should include: • the length of a wire at constant temperature • combinations of resistors in series and parallel (10.2.15).
AQA-8464-SOW-ELEC.DOCX