# NCERT Class X Science Solutions: Chapter 12 – Electricity Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

Doorsteptutor material for ICSE/Class-10 is prepared by world's top subject experts: get questions, notes, tests, video lectures and more- for all subjects of ICSE/Class-10.

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