Name an instrument used for measuring electric potential difference by drawing a diagram. Show how this instrument is connected in an electric circuit. Why does this practically not consume any electric energy from the electric current?

An instrument commonly used to measure electric potential difference is the voltmeter. Below is a simple diagram illustrating how a voltmeter is connected in an electric circuit.

Diagram of a Voltmeter in a Circuit

In the diagram, the voltmeter is connected in parallel with the component across which the voltage is being measured.

• Battery: Provides the electric potential.
• Resistor: Represents the load in the circuit.
• Voltmeter: Connected in parallel to measure the voltage across the resistor.

Why a Voltmeter Doesn't Consume Significant Energy

Voltmeter designs incorporate a very high internal resistance. This high resistance means that when the voltmeter is connected to the circuit, it draws an extremely small amount of current. As a result, it does not significantly affect the overall circuit operation or consume electric energy. This characteristic allows for accurate voltage measurements without altering the circuit's behavior.