Question

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

• A. 1-a, 2-b, 3-c, 4-d
• B. 1-a, 2-d, 3-b, 4-a
• C. 1-d, 2-b, 3-c, 4-a
• D. 1-d, 2-c, 3-b, 4-a

Answer 1

The correct option is D 1-d, 2-c, 3-b, 4-a

An electric motor is a simple mechanical device. It is a device which converts electrical energy to mechanical energy. A dynamo is a device which converts the mechanical energy into the electrical energy. It is also known as the electric generator. Transformer is an electrical device used to increase or decrease the voltage of an alternating current source. Electric Bell is one of the uses of electromagnet. It works on the principle of magnetic effect of current.