4.4. Electrical safety
A subsection of Physics, 0625, through 4. Electricity and magnetism
Listing 10 of 187 questions
In the boxes of the left column below are some electrical hazards. In the boxes of the right column are means of protecting against those hazards. From each hazard, draw a line to the appropriate protection. One line has been drawn as an example. Use electrical hazard loose live wire touches metal case of appliance fuse or circuit-breaker in the circuit use of switches with a nylon pull-cord earth wire connected to the metal case of the appliance visual check of cables before connecting appliance worn insulation on cable to an appliance steam in a washroom condenses inside a switch wires get hot because current is too high means of protection
0625_s06_qp_2
THEORY
2006
Paper 2, Variant 0
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Fuses are often included in circuits. In the space below, draw the circuit symbol for a fuse. When the statements in the boxes below are put in the correct order, they describe how a fuse protects a circuit. A fuse wire heats up B circuit is broken, so current stops C fuse wire melts D current becomes too high On the line below, list the letters of the four boxes in the correct order. By mistake, a fuse with too high a rated value is put in the fuse-holder in a circuit. State two possible outcomes of this mistake. 1. 2.
0625_s08_qp_2
THEORY
2008
Paper 2, Variant 0
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A warning on the packaging of a light switch purchased from an electrical store reads SAFETY WARNING This push-button switch is not suitable for use in a washroom. Lights in washrooms should be operated by pull-cord switches. Explain why it might be dangerous to use a push-button switch in a washroom. Why is it safe to use a pull-cord switch in a washroom? An electric heater, sold in the electrical store, has a current of 8 A when it is working normally. The cable fitted to the heater has a maximum safe current of 12 A. Which of the following fuses would be most suitable to use in the plug fitted to the cable of the heater? Tick one box. 5 A 10 A 13 A 20 A The cable for connecting an electric cooker is much thicker than the cable on a table lamp. Why do cookers need a much thicker cable? What would happen if a thin cable were used for wiring a cooker to the supply?
0625_s10_qp_21
THEORY
2010
Paper 2, Variant 1
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Questions Discovered
187