Page 20 - CHAPTER-1 (Electricity)

CHAPTER 1

ELECTRICITY

Different types of resistors with different

colour coding have been shown in the

adjoining figure.

Fig 10:

Example 6:

The potential drop between the two terminals of an electric heater

is 75V when it draws a current of 5A from the source. Find the current

that the heater will draw if the potential difference is increased to

150V?

Solution:

Given, potential difference, V = 75V, current, I = 5A

We know that,

V 75
R= ⇒R= =15Ω
I 5

When the potential difference is increased to 150V, then current is

V ' 150
'
I = = =10A
R 15

So, the current through the heater becomes 10A.

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