Demonstrate measuring the energy transferred to a low voltage motor as it lifts a load. Compare it to the gravitational potential energy gained by the load. 4.7.2.7 The power of an electrical Define power. 1 Why is a 7 W energy efficient Demonstrate a of cont. device is related to the light bulb cheaper to run than a the National Grid to State the equation that potential difference across it 100 W incandescent light show the effect of links power, potential and the current through it by bulb? sending electrical difference and current. the equation: energy at high and low Calculate which fuse rating Calculate the power of potential differences. power = potential difference would be needed in a plug for an electrical appliance × current a given electrical appliance given the potential when given the power rating [P = V I] difference and the and the potential difference. current. power = (current)2 × fuse should you put into a resistance hair drier and why? [P = I2 R] Conversion to SI units may power, P, in watts, W also be required.
Demonstrate measuring the energy transferred to a low voltage motor as it lifts a load. Compare it to the gravitational potential energy gained by the load. 4.7.2.7 cont. The power of an electrical device is related to the potential difference across it and the current through it by the equation: power = potential difference × current [P = V I] power = (current)2 × resistance [P = I2 R] power, P, in watts, W Define power. State the equation that links power, potential difference and current. Calculate the power of an electrical appliance given the potential difference and the current. 1 Why is a 7 W energy efficient light bulb cheaper to run than a 100 W incandescent light bulb? Calculate which fuse rating would be needed in a plug for a given electrical appliance when given the power rating and the potential difference. fuse should you put into a hair drier and why? Conversion to SI units may also be required. Demonstrate a of the National Grid to show the effect of sending electrical energy at high and low potential differences.
AQA-8465-SOW-MAI.DOCX