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The potential difference between the terminals of an electric heater is 80 V when it draws a current of 5 A from the source. What current will the heater draw if the potential difference is increased to 120 V?
  • a)
    7.5 A
  • b)
    9 A
  • c)
    5 A
  • d)
    6 A
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The potential difference between the terminals of an electric heater ...
We are given, potential difference V = 80 V, current I = 5 A.
According to Ohm’s law,
R = V/I
R = 80/5 = 16 Ω
When the potential difference is increased to 120 V the current is given by current = V/R
120/16 = 7.5 A
The current through the heater becomes 7.5 A
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Most Upvoted Answer
The potential difference between the terminals of an electric heater ...
Given information:
Potential difference (V1) = 80 V
Current (I1) = 5 A

We need to find the current (I2) when the potential difference is increased to 120 V.

Formula:
The relationship between potential difference (V), current (I), and resistance (R) is given by Ohm's Law:

V = I * R

where,
V is the potential difference,
I is the current, and
R is the resistance.

Solution:
1. Finding the resistance:
Using Ohm's Law, we can rearrange the formula to find the resistance:

R = V1 / I1

Substituting the given values:
R = 80 V / 5 A
R = 16 Ω

2. Finding the current:
Using Ohm's Law, we can rearrange the formula to find the current:

I2 = V2 / R

Substituting the given values:
V2 = 120 V (the increased potential difference)
R = 16 Ω (the resistance)

I2 = 120 V / 16 Ω
I2 = 7.5 A

Therefore, the current drawn by the electric heater when the potential difference is increased to 120 V is 7.5 A.

Answer: Option (a) 7.5 A
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The potential difference between the terminals of an electric heater is 80 V when it draws a current of 5 A from the source. What current will the heater draw if the potential difference is increased to 120 V?a)7.5 Ab)9 Ac)5 Ad)6 ACorrect answer is option 'A'. Can you explain this answer?
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