Quick Answer: When A Voltmeter Is Connected Across The Terminals?

When connected across the terminals of a cell a voltmeter?

When connected across the terminals of a cell, a voltmeter measures 5 V and a connected ammeter measures 10 A of current. A resistance of 2 ohm s is connected across the terminals of the cell.

What does a voltmeter connected across a cell measure?

A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. An ammeter is a measuring device used to measure the electric current in a circuit.

How is a voltmeter connected across a resistance?

A voltmeter is connected in parallel at the two points between which the potential difference is to be measured. Therefore, a voltmeter needs to have a large resistance so that very little current is diverted through it.

What happens when voltmeter is connected in parallel?

A voltmeter measures the potential difference of the circuit and it has high internal resistance. When the voltmeter is connected in parallel with a circuit component, the amount of current passing through the voltmeter is very less. Therefore, the current through the circuit is unaltered.

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When a voltmeter is connected across a 400 ohm resistance?

Answer. The correct answer to the question is 22.5 volt. CALCULATION: As per the question, first the voltmetre is connected across 400 ohm resistance.

How are an ammeter and a voltmeter connected in an electric circuit?

The voltmeter is connected in parallel with the circuit to be measured. Consequently an ideal voltmeter will have infinite resistance. An ammeter is connected in series with the circuit to be measured. The ideal ammeter will have zero resistance so as not to disturb the circuit.

How do you read a voltmeter?

Hence, the voltmeter reading would be V=IR = 0.

What is voltmeter with diagram?

A voltmeter is an instrument used for measuring electric potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in proportion to the voltage measured; digital voltmeters give a numerical display of voltage by use of an analog-to-digital converter.

How does a voltmeter work?

Voltmeter works on the principle of Ohm’s law, which states that the voltage across a resistance is directly proportional to the current passing through it. In order to implement it in real time, we form the construction of a galvanometer, such that a coil is suspended in a magnetic field.

When a high resistance voltmeter is connected?

When a high resistance voltmeter directly across a resistor. An electric cell is sending current in the circuit in which a rheostat is also connected. Ohm’s law is defined as, The current flowing through the conductor is directly proportional to the voltage difference.

How voltmeter should be connected to a resistor in order to find potential difference across it?

Answer: Explanation: a voltmeter must always be connected in parallel with the circuit whereas an ammeter should always be connected in series.

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When a high resistance voltmeter is connected directly across a resistor its reading is 2v?

When a high resistance voltmeter is connected across a resistance R and its reading is 2 V. An electric cell is sending the current of 0. 4 A in the electric circuit in which a rheostat is connected to vary the current.

What will happen if by mistake a voltmeter is connected in series and ammeter in parallel?

By mistake, a voltmeter is connected in series and an ammeter is connected in parallel, with a resistance in an electrical circuit. Due to it, the current in the circuit becomes very low. As voltmeter measures potential difference between the two points, it will show the reading but will not be damaged.

Why voltmeter is connected in parallel and it has high resistance?

Voltmeter is used to measure potential difference.It is always connected in parallel across the points where the potential difference is to measured so one end of the voltmeter is connected to the point A of a resistance AB and the other end to the point B,and also it has a high resistance so that it takes a negligible

Why ammeter should not be connected in parallel?

An ammeter is a device which measures the amount of current flowing in a circuit. It is a very low resistance(nearly zero) device. If it will be connected in parallel, it would draw most of the current and would get damaged.

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