# NCERT Class X Science Solutions: Chapter 12 – Electricity Part 1

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Question 1:

A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is then the ratio is

Resistance of a piece of wire is directly proportional to its length. If the piece of wire has a resistance R and the wire is cut into five equal parts.

The resistance of each part

All the five parts are connected in parallel. Hence, equivalent resistance is given as 1

Hence, the option D is correct.

Question 2:

Which of the following terms does not represent electrical power in a circuit?

We know that electric power is given by … (i)

So, the option C is correct.

According to Ohm’s law, … (ii)

Now putting the value of V from (ii) in (i), we get

So, the option A is correct.

Now putting the value of I from (ii) in (i), we get

So, the option D is correct.

Hence, the option B does not represent electrical power in a circuit.

Question 3:

An electric bulb is rated and. When it is operated on, the power consumed will be

1. 100 W

2. 75 W

3. 50 W

4. 25 W