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37) b) IR²
38) c) Increase heavily
39) b) it takes negligible amount of current
38) c) Increase heavily
39) b) it takes negligible amount of current
Answered by
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37.(2)IR²
Ohm’s Law: V = IR
Power dissipated (Joule heating) =
P = I ²R = I.V
38.(3) The overflow of current leads to short-circuit.
39.(2)
A voltmeter measures the voltage difference between two different points (say, on different sides of a resistor), but it should not change the amount of current going through the element between those two points. So, it should have very high resistance so that it doesn't "draw" current through it.
Hope it helps
Ohm’s Law: V = IR
Power dissipated (Joule heating) =
P = I ²R = I.V
38.(3) The overflow of current leads to short-circuit.
39.(2)
A voltmeter measures the voltage difference between two different points (say, on different sides of a resistor), but it should not change the amount of current going through the element between those two points. So, it should have very high resistance so that it doesn't "draw" current through it.
Hope it helps
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