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Chapter: 18 / Q: 20
The purpose of a fuse (or circuit breaker) is to prevent any fl ow of current. How is this done?
Chapter: 18 / Q: 21
When electrical equipment becomes faulty, the casing (if made of metal) may become live. In this case what is the function of the earth wire on the equipment?
Chapter: 18 / Q: 22
What are the three wires connected to household ‘three pin plugs’ on electrical cords called?
Chapter: 18 / Q: 23
Suppose that while crawling around inside the roof space of your house, you touch a bare wire with your bare hand while touching the brick wall with the other bare hand. Which of the following wires would be most likely to deliver a fatal shock?
Chapter: 18 / Q: 24
In an electrical device, a correctly installed earth wire provides protection against what?
Chapter: 18 / Q: 25
The electrical resistance of the body, measured from hand to hand, will be different on different occasions. Why is this? Because the resistance of the skin:
Chapter: 18 / Q: 26
What could be a correct defi nition of macro-electrocution? ‘That phenomenon which results from a prolonged macro-shock produced by:
Chapter: 18 / Q: 27
Choose the correct alternative to make the following sentence correct. “If a person is in contact with the active wire of a domestic 240 volt electricity supply, a macroshock will occur if the current that fl ows active/ ground”
Chapter: 18 / Q: 28
In the fl uids of the human body, what are the carriers of charge that move through fl uids called?
Chapter: 18 / Q: 29
Complete the sentence: ‘Defi brillation’ is the process where for a few milliseconds, a direct current of about:
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