**Exercise2**

1. Suppose that the dc generator in Figure
1 produces 10 V and the potentiometer is set to a value of 10 ohms. What is the
current?

2. Imagine that dc generator in Figure 1
produces 100 V and the potentiometer is set to 10 kiloohms. What is the
current?

3. Suppose that dc generator in Figure 1
is set to provide 88.5 V, and the potentiometer is set to 477 Megaohms. What is
the current?

4. Suppose the potentiometer in Figure 1
is set to 100 ohms, and the measured current is 10 mA. What is the dc voltage?

5. Adjust the potentiometer in Figure 1 to
a value of 157 kiloohms, and suppose the current reading is 17.0 mA. What is
the voltage of the source?

6. Suppose you set the potentiometer in Figure
1 so that the meter reads 1.445 A, and you observe that the potentiometer scale
shows 99 ohms. What is the voltage?

7. If the voltmeter in Figure
1 reads 24 V
and the ammeter shows 3.0 A, what is the resistance of the potentiometer?

8. What
is the value of the resistance in Figure 1 if the current is 18 mA and the
voltage is 229 mV?

9. Suppose
the ammeter in Figure 1 reads 52 uA and the voltmeter indicates 2.33 kV.
What is the resistance?

10. Suppose
that the voltmeter in Figure 1 reads 12 V and the ammeter shows 50 mA. What is the
power dissipated by the potentiometer?

11. If
the resistance in the circuit of Figure 1 is 999 ohms and the voltage source delivers 3 V, what is the power dissipated by the
potentiometer?

12. Suppose the resistance in Figure 1 is 47 kiloohms and the current is 680 mA. What
is the power dissipated by the potentiometer?

13. How
much voltage would be necessary to drive 680 mA through a resistance of 47
kiloohms?

14. Consider
five resistors in parallel. Call them R1 through R5. Let the resistance values be as
follows:

*R*1 = 100 ohms,*R*2 = 200 ohms,*R*3 = 300 ohms,*R*4 = 400 ohms, and*R*5 = 500 ohms. What is the total resistance?
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