Question

Example 86 The potential difference
between the terminals of an
electric heater is 75 v when it
draues a current of 5 A from
the source. What current will
the
heater decaw, the
potential difference is increased
to 150 V ?​

Answer 1

Answer:

10 Amperes

Explanation:

Given :

• Potential difference between the terminals of the electric heater = 75 Volts

• Current drawn by the electric heater = 5 Amperes

To find :

• Current when the potential difference is increased to 150 volts

Using ohms law:

V=IR

75=5×R

R=75/5

R=15 ohms

The resistance is constant

Now Substituting for second case:

150 = I×15

I = 150/15

I = 10 amperes

The current drawn is equal to 10 Amperes

Answer 2

AnswEr :

Given that potential difference is 75 v when current is 5 A.

We have to find current drawn by heater when potential difference is 150 v.

In 1st case, we have,

➡ Potential difference (v) = 75 v

➡ Current (I) = 5 A

➡ Resistance (R) = ?

We will use Ohm's law here,

→ I = V/R

Substituting values,

→ 5 = 75/R

→ 5R = 75

→ R = 75/5

→ R = 15Ω

∴ Resistance of heater = 15Ω

Now in 2nd case we have,

➡ Potential difference (v) = 150 V

➡ Resistance (R) = 15Ω

➡ Current drawn in heater (I) = ?

Now we will use the same law :-

→ I = V/R

Substituting values,

→ I = 150/15

→ I = 10 A

∴ Current drawn in heater = 10 Amperes.