What do ammeters measure?

What do ammeters measure?

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

Answer: (B)

Ammeters measure the flow of electric charge, i.e., the current through a conductor. Current is the rate at which charges pass a point, measured in amperes. An ammeter is placed in series with the part of the circuit you want to measure so all the current flows through it, and it is designed to have very low resistance so it doesn’t significantly alter the circuit. Voltage, the potential difference, is measured with a voltmeter (placed in parallel). Resistance is measured with an ohmmeter or can be inferred from power and voltage. Power is calculated from voltage and current (P = VI) and is measured with a wattmeter, not an ammeter.

Ammeters measure the flow of electric charge, i.e., the current through a conductor. Current is the rate at which charges pass a point, measured in amperes. An ammeter is placed in series with the part of the circuit you want to measure so all the current flows through it, and it is designed to have very low resistance so it doesn’t significantly alter the circuit.

Voltage, the potential difference, is measured with a voltmeter (placed in parallel). Resistance is measured with an ohmmeter or can be inferred from power and voltage. Power is calculated from voltage and current (P = VI) and is measured with a wattmeter, not an ammeter.