If Power = 100 watt and Resistance = 4 ohms, then Current (I) = ___________?

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RRB ALP Instrument Mechanic 23 Jan 2019 Official Paper (Shift 1)
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  1. 10 A
  2. 100 A
  3. 2 A
  4. 5 A

Answer (Detailed Solution Below)

Option 4 : 5 A
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Detailed Solution

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Concept:

The power dissipated in a resistor is given by

P = I2 R

Where,

P = Power dissipation in watt

I = Current in ampere

R = Resistance in Ω

Calculation:

Given: P = 100 watt

R = 50 Ω

Power (P) will be:

\(P=I^2R=I^2\times 50\)

⇒ I = 5 A

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