How is a voltmeter connected in a circuit, unlike an ammeter?

How is a voltmeter connected in a circuit, unlike an ammeter?

• A. In parallel - on its own separate branch of the circuit
• B. In series with components
• C. Across the power source only
• D. Across the load only

Answer: (A)

Voltmeter placement is about measuring the voltage difference across a component without changing the circuit. Because it has very high resistance, it draws almost no current, so it must be connected in parallel with the element whose voltage you want to read. This parallel hookup puts the voltmeter on its own branch and lets it sense the potential difference without diverting current away from the component. In contrast, an ammeter is meant to measure current flowing through a path, so it is placed in series. That way the same current passes through the meter and the component. If a voltmeter were placed in series, its high resistance would distort the current and voltages; if you connected it only across the power source or only across the load, you’d be measuring only that portion rather than the voltage across the desired element.

Voltmeter placement is about measuring the voltage difference across a component without changing the circuit. Because it has very high resistance, it draws almost no current, so it must be connected in parallel with the element whose voltage you want to read. This parallel hookup puts the voltmeter on its own branch and lets it sense the potential difference without diverting current away from the component.

In contrast, an ammeter is meant to measure current flowing through a path, so it is placed in series. That way the same current passes through the meter and the component. If a voltmeter were placed in series, its high resistance would distort the current and voltages; if you connected it only across the power source or only across the load, you’d be measuring only that portion rather than the voltage across the desired element.