Voltmeter Working

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What is the primary function of a voltmeter?

A voltmeter measures the electric potential difference between two points in an electric circuit.

How is a voltmeter connected in a circuit?

A voltmeter is connected in parallel with the component across which the voltage is to be measured.

What type of resistance does a voltmeter have?

A voltmeter has high resistance to minimize the current drawn from the circuit.

Why should a voltmeter have high internal resistance?

To prevent it from drawing too much current from the circuit, which could alter the voltage being measured.

What can happen if a voltmeter is connected incorrectly in a circuit?

It can create a short circuit or show an incorrect voltage reading.

What is the unit of measurement for a voltmeter?

Volts, which measures the electrical potential difference.

Can a voltmeter measure both AC and DC voltages?

Yes, some voltmeters can measure both AC and DC voltages, while others are designed for just one type.

What role does a galvanometer play in a voltmeter?

A galvanometer is the core component that detects and measures current flow in a voltmeter.

How does digital voltmeter display measurements?

A digital voltmeter displays measurements numerically on an LCD or LED screen.

What is the advantage of using a digital voltmeter over an analog voltmeter?

Digital voltmeters offer higher precision, easier readability, and reduced human reading error.

What safety precaution must be taken when using a voltmeter?

Ensure that the voltmeter is set to the correct voltage range to avoid damage to the device.

What is the role of a range selector in a voltmeter?

A range selector adjusts the scale of voltage to be measured, ensuring accuracy and protecting the voltmeter.

Can voltmeters be used to measure high voltage?

Yes, but they must be rated for high voltage and used with care to avoid hazards.

What is an example of a voltmeter application?

Voltmeters are used in household plug-ins to check the voltage supply and in cars to monitor battery voltage.

How does temperature affect a voltmeter's accuracy?

Extreme temperatures can alter a voltmeter's resistance, impacting measurement accuracy.

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