Page 12 - 10-phy-14 Current Electricity

What is the potential difference across it? A voltmeter of 1kΩ is
connected across this resistance to measure the potential difference
(Fig.143.2b). What potential drop will be indicated by the voltmeter?
What conclusion do you draw from this example?
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4. What arrangement, parallel or series, would you use to connect the
lights in a room? Explain your reason.
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5. Why the main fuse wire is connected in series with the electric meter in an
household electric circuit?

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6. Consider the given circuit. What is the 3V

potential difference across the +-

two bulbs and current passing Key Power Supply
through each bulb?.

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Extended 1. Design an experiment to find the equivalent resistance of three resistors
Activity such that one resistor is connected in series with the parallel combination
of other two. Compare it with theoretically calculated result.
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BRAIN TEASER
1. What will happen if the electrical appliances are connected in series in

a household electrical circuit?
2. What will happen to a circuit if a student by mistake interchanges the

positions of ammeter and voltmeter?

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