The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 120 V?

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  1. Class 10
  2. Chapter 12 Class 10 - Electricity

Transcript

Example 12.4 The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 120 V? Potential difference = V = 60 V Current = I = 4 A By ohm’s law, V = I R 𝑉/I = R R = 𝑉/I R = 60/4 R = 15 Ω Now, the potential difference is increased 120 V We need to find current (I) drawn Now, Potential difference = V = 120 V Resistance = 15 Ω By ohm’s law, V = I R 𝑉/I = R I = 𝑉/R I = 120/15 I = 8 A Current through the heater is 8 A

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.