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The device used for measuring potential difference across the ends of a conductor is:
Galvanometer
Voltmeter
Battery
Ammeter
Voltmeter
A voltmeter is an electrical instrument specifically designed to measure the electrical potential difference (voltage) between two points in an electrical circuit. It is always connected in parallel across the component for which the potential difference is to be measured.
A voltmeter is an electrical instrument specifically designed to measure the electrical potential difference (voltage) between two points in an electrical circuit. It is always connected in parallel across the component for which the potential difference is to be measured.
Think of it like a pressure gauge connected across a section of a pipe; it measures the drop in water pressure between two points without letting significant water flow through the gauge itself.
V for Voltage, V for Voltmeter; P for Parallel (Voltmeter is connected in parallel).
V=I├ЧR тАФ Ohm's Law, representing the relationship between voltage (V), current (I), and resistance (R).
A voltmeter operates based on the principle of high electrical resistance. Because it is connected in parallel, it must have a very high internal resistance to ensure that it draws a negligible amount of current from the main circuit, thereby avoiding an alteration of the circuit's original operating conditions.
A voltmeter must always be connected in parallel to the component under observation.
An ideal voltmeter is considered to have infinite electrical resistance.
Potential difference is measured in units of Volts (V).
Allows real-time monitoring of electrical potential without interfering with circuit current flow.
Non-ideal voltmeters can draw some current, leading to slight measurement errors in high-resistance circuits.
Measuring the voltage drop across resistors in a DC circuit.
Testing the health and charge of batteries.
| Feature | Ammeter | Voltmeter |
|---|---|---|
Connection Type | Series | Parallel |
Resistance | Very Low | Very High |
Galvanometer: Detects small electric currents in a circuit.
Ammeter: Measures current flow in a circuit and is connected in series.
Battery: Acts as a source of potential difference (EMF) to drive the current.
B is correct тАФ A voltmeter is the standard device used to measure the electric potential difference between two points in a circuit.
Always remember the simple rule: Ammeter for Amps (current) in Series, Voltmeter for Volts (potential) in Parallel.
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