Which quantity is measured by an ammeter in a circuit?

Which quantity is measured by an ammeter in a circuit?

• A. Voltage
• B. Power
• C. Current
• D. Resistance

Answer: (C)

An ammeter measures the rate at which electric charges flow through a circuit, known as current. This current is the amount of charge passing a point per second, measured in amperes. To read the circuit’s current accurately, the meter is placed in series with the components so all the current goes through it. Ideally, an ammeter has almost zero resistance so it doesn’t change the current it’s trying to measure. This is different from a voltmeter, which measures voltage (potential difference) and is connected in parallel across a component. An ohmmeter, on the other hand, measures resistance. Power can be calculated from current and voltage, but an ammeter itself directly measures current.

An ammeter measures the rate at which electric charges flow through a circuit, known as current. This current is the amount of charge passing a point per second, measured in amperes. To read the circuit’s current accurately, the meter is placed in series with the components so all the current goes through it. Ideally, an ammeter has almost zero resistance so it doesn’t change the current it’s trying to measure. This is different from a voltmeter, which measures voltage (potential difference) and is connected in parallel across a component. An ohmmeter, on the other hand, measures resistance. Power can be calculated from current and voltage, but an ammeter itself directly measures current.