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Two Parallel Currents

Which of the ...

Question

Which of the following is based on mechanical effect of electric current?

A

AC Dynamo

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B

DC Dynamo

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C

AC or DC motor

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D

Electric Geyser

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Solution

The correct option is D AC or DC motor
Working of an electric motor is based on the mechanical effect of electric current. A conductor carrying a current is placed in a magnetic field experiences a mechanical force. In the motor, when a current is passed through a rectangular coil of wire placed in a magnetic field, the coil rotates continuously.

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Q. To convert mechanical energy into electrical energy, one can use

(a) DC dynamo
(b) AC dynamo
(c) motor
(d) transformer

Q. Match the following:

\begin{matrix} Device & Principle 1 & Electric Motor & a & Magnetic effect of current 2 & Dynamo & b & Increase or decrease the alternating voltage 3 & Transformer & c & Converts mechanical energy to electrical energy 4 & Electric Bell & d & Converts electrical energy to mechanical energy \end{matrix}

Q. Assertion :An electric motor converts electrical energy to mechanical energy. Reason: The working of the motor is based on mutual induction.

Q. (a) Name one device which works on the magnetic effect of current.
(b) Name one device which works on the phenomenon of electromagnetic induction.
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(d) Describe the principle of working of an electric motor.
(e) Explain the principle of working of an electric generator.

Q. State whether true or false:

A dynamo converts electric energy into mechanical energy.

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