Question

why is ammeter is connected in series and voltmeter in parallel.​

Answer 1

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✧ Ammeter:

• 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. Hence, it is connected in series.

 

✧ Voltmeter:

• A voltmeter is a device which measures the amount of potential difference across a resistor or a series of resistors.
• It is a very high resistance(nearly infinite) device.
• If it will be connected in series, it would would increase the equivalent resistance of the circuit to nearly infinite and no current would

Answer 2

Before going further, we have to know :

➹ Ammeter

→ An ammeter is a device which is used to measure the electric current in the circuit.

➹ Voltmeter

→ A voltmeter is an instrument which is used to measure the potential difference across the circuit.

★ Why is ammeter is connected in series ?

• Ammeter is connected in series because :
• As we know in a series, the current will remain same.
• Ammeter is used to measure the electric current in the circuit,
• Therefore, it is connected in series so that the same current that in circuit flows.
• It makes it easy to measure current.

Note :- Ammeter is very low resistance device.

★ Why voltmeter is connected in parallel?

• A voltmeter is connected in parallel because :
• As we know in parallel, voltage remain same across the circuit.
• A voltmeter is used to measures the potential difference of the circuit$.$
• Therefore, it is connected in parallel with a circuit component, and makes it easier to measure the potential difference by dividing the amount of current passing through the voltmeter.

Note :- Voltmeter is high internal resistance device.

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∆ What if ammeter is connected in parallel?

☆ If it is connected in parallel, the net resistance will decrease which leads to high flow of current and it may also damage the ammeter and even short circuits occurs.

∆ What if Voltmeter is connected in series?

☆ If voltmeter is connected in series, then due to high resistance , current will not flow easily.