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Chapter: 18 / Q: 10
The unit of potential difference is the volt. What does the number of volts tell us?
Chapter: 18 / Q: 11
Which three electrical quantities does Ohm’s law relate to each other?
Chapter: 18 / Q: 12
Given Ohm’s law i.e. potential difference (V) is the product of current (I) and resistance (R), which of the following statements is true? If potential difference is fi xed (at say, 240 V):
Chapter: 18 / Q: 13
A household light globe with a power rating of 60 W operates at a potential difference of 240 V and has a resistance of 960 . Using this information and Ohm’s law, the current (I) may be calculated to be
Chapter: 18 / Q: 14
A person, holding to the edge of the bath, steps out onto an exposed wire in a frayed electrical cord attached to a domestic (240 V) radiant heater on the fl oor. Consequently a fatal current of 100 mA fl ows between their hand and foot. What must be the electrical resistance between these two point
Chapter: 18 / Q: 15
Ohm’s law may be stated in the form: ‘the current fl owing in a circuit is the potential difference divided by the electrical resistance in the circuit’. If a person whose hand to hand resistance is 80,000  touches a live wire (attached to 240 V mains supply) and a wall at the same time?
Chapter: 18 / Q: 16
What is one difference between static electricity and current electricity?
Chapter: 18 / Q: 17
What is one difference between direct current (DC) and alternating current (AC)?
Chapter: 18 / Q: 18
Which one of the following statements is true?
Chapter: 18 / Q: 19
In order for the ‘on-off’ switch and the fuse to operate as intended in AC circuits, which wires must they be placed on?
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