Question

Each circled letter in the circuit diagram represents a meter that is used to measure a quantity in the circuit. Which meters are ammeters?
A. B and D

B. A and C

C. A and B

D. C and D

Answer 1

Answer:

The correct option is B): meters A and C.

Explanation:

Answer 2

The correct option is B): meters A and C. In fact, both A and C are ammeters. An ammeter is a device used to measure the current in a branch of a circuit. In order to work properly, an ammeter should be connected in series to a resistor, in order to have the same amount of current that passes through the resistor. In this circuit, we see that devices A and C are both connected in series to a resistor, so they are ammeters. Instead, devices B and D are connected in parallel, so they do not measure the current but the voltage (in fact, they are called voltmeter).