4.7.2.2 The current through a Define resistance. 1 What is resistance? Model the effect of component depends on both resistance on a circuit. Describe and explain Why are materials with low the resistance of the You can do this with how increasing the resistance chosen for power component and the potential clear tubing and resistance in a circuit cables? difference across the coloured water to act as will affect the current What are superconductors? component. The greater the the current. Pinch the flowing through the resistance of the component tubing to show higher Research what circuit. the smaller the current for a resistance. superconductors do and what Use the equation to given potential difference they are made from. Investigate how Teachit Science calculate the potential (p.d.) across the component. increasing the resource How can the resistance of a difference (voltage), potential difference = current resistance of a circuit fuse?’ component be calculated current or resistance ‘Which × resistance affects the current using the current and potential when given the other flowing. difference? [V = I R] two values. Why does increasing the potential difference, V, in State the correct SI voltage in a circuit also volts, V units for each quantity increase the current flowing (potential difference, current, I, in amperes, A through it? current and resistance, R, in ohms, resistance). Ω What is meant by resistance? Find the resistance of some electrical components using
4.7.2.2 The current through a component depends on both the resistance of the component and the potential difference across the component. The greater the resistance of the component the smaller the current for a given potential difference (p.d.) across the component. potential difference = current × resistance [V = I R] potential difference, V, in volts, V current, I, in amperes, A resistance, R, in ohms, Ω Define resistance. Describe and explain how increasing the resistance in a circuit will affect the current flowing through the circuit. Use the equation to calculate the potential difference (voltage), current or resistance when given the other two values. State the correct SI units for each quantity (potential difference, current and resistance). 1 What is resistance? Why are materials with low resistance chosen for power cables? What are superconductors? Research what superconductors do and what they are made from. How can the resistance of a component be calculated using the current and potential difference? Why does increasing the voltage in a circuit also increase the current flowing through it? What is meant by resistance? Find the resistance of some electrical components using Model the effect of resistance on a circuit. You can do this with clear tubing and coloured water to act as the current. Pinch the tubing to show higher resistance. Investigate how increasing the resistance of a circuit affects the current flowing. Teachit Science resource ‘Which fuse?’
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