Question

How much current will an electric heater draw from a 220 volt line, if the resistance of the heater is 50 ohm's?

1. 44 A
2. 110 A
3. 4.4 A
4. 11 A

Answer 1

Correct Answer - Option 3 : 4.4 A

Concept:

Ohms Law

• Electric current: The rate of flow of electric charge with respect to time is electric current. 
• Potential difference: The work done in bringing a unit positive charge from one point to another is called the potential difference. It is required for the current to flow. 
• Resistance: When current passes through the conductor, it is resisted by the property called resistance. 
• Ohms Law: At constant temperature, a potential difference is directly proportional to the current. 

V ∝ I

or

V = IR 

R is resistance

Calculation:

Given

Voltage V = 220 V

Resistance R = 50 Ω 

Current I = V / R = 220 V /  50 Ω = 4.4 A

So the correct option is 4.4 A