Question 1

In the circuit shown in Figure A3.2, what is the reading of the ammeter (A) in amperes? (Assume all batteries are ideal and use Kirchhoff's rules to solve for the currents.)

Accepted Answer

$$0.2$$

Question 2

What is the reading of the voltmeter (V) connected across the $$30\ \Omega$$ resistor in Figure A3.2?

Accepted Answer

$$4\ \mathrm{V}$$

Question 3

Which of the following correctly applies Kirchhoff's loop rule to the left loop (containing the $$27\ \mathrm{V}$$ and $$12\ \mathrm{V}$$ batteries, $$10\ \Omega$$ and $$20\ \Omega$$ resistors) in Figure A3.2?

Accepted Answer

$$27 - 10I_1 - 20I_2 - 12 = 0$$

Question 4

If the current through the $$20\ \Omega$$ resistor is $$0.2\ \mathrm{A}$$, what is the power dissipated by this resistor?

Accepted Answer

$$0.8\ \mathrm{W}$$

Question 5

Which equation represents the sum of the currents at the top left junction in Figure A3.2, according to Kirchhoff's junction rule?

Accepted Answer

$$I_1$$ = $$I_2$$ + $$I_3$$

Question 6

If the $$24\ \mathrm{V}$$ battery is removed from the circuit, what happens to the reading of the voltmeter across the $$30\ \Omega$$ resistor?

Accepted Answer

It decreases

Question 7

Suppose the $$10\ \Omega$$ resistor is replaced with a $$5\ \Omega$$ resistor. How does this affect the current through the ammeter?

Accepted Answer

The current increases

Question 8

Which of the following best describes the function of the voltmeter in the circuit of Figure A3.2?

Accepted Answer

It measures the potential difference across the $$30\ \Omega$$ resistor

Question 9

If the internal resistance of the batteries is not negligible, how would this affect the readings of the ammeter and voltmeter?

Accepted Answer

Both readings would decrease

Question 10

If the $$30\ \Omega$$ resistor is short-circuited (replaced by a wire), what is the new reading of the voltmeter?

Accepted Answer

$$0\ \mathrm{V}$$

Analyzing Ammeter and Voltmeter Readings in a Multi-Loop Circuit

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