1 why should the voltmeter and ammeter be read, Ask an Expert

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1. Why should the voltmeter and ammeter be read simultaneously to decide the resistance of a circuit component?

2. If a lamp has a resistance of 25 ohm, what should the resistance of a second lamp, which is connected in parallel to the first, be for the total resistance to be 18.75 ohm?

3. A radio with a resistance of 40 ohm and a clock with a resistance of 20 ohm are connected in series on a 120V line.

1. What is the current?

2. What is the equivalent resistance?

3. What is the total voltage drop across the radio and the clock? What is the voltage drop across each component?

4. What is the power supplied to the circuit? How much power is dissipated by each component?

5. Presume the radio and clock were connected in parallel. What is the equivalent resistance?

6. In the case that they are connected in parallel, what is the current in the radio, the current in the clock, and the current during the source?

7. What is the power supplied to the circuit in the parallel case? How much power is dissipated by each component?

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