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A 100 W bulb is connected to a 220 V supply. What is the current flowing through

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Question: A 100 W bulb is connected to a 220 V supply. What is the current flowing through the bulb?

Options:

  1. 0.45 A
  2. 1.0 A
  3. 2.2 A
  4. 2.5 A

Correct Answer: 0.45 A

Solution: 

Using the formula P = VI, where P = 100 W and V = 220 V, the current I = P/V = 100/220 ≈ 0.45 A.

A 100 W bulb is connected to a 220 V supply. What is the current flowing through

Practice Questions

Q1
A 100 W bulb is connected to a 220 V supply. What is the current flowing through the bulb?
  1. 0.45 A
  2. 1.0 A
  3. 2.2 A
  4. 2.5 A

Questions & Step-by-Step Solutions

A 100 W bulb is connected to a 220 V supply. What is the current flowing through the bulb?
  • Step 1: Identify the power of the bulb, which is given as 100 W.
  • Step 2: Identify the voltage of the supply, which is given as 220 V.
  • Step 3: Use the formula P = VI, where P is power, V is voltage, and I is current.
  • Step 4: Rearrange the formula to find current I: I = P / V.
  • Step 5: Substitute the values into the formula: I = 100 W / 220 V.
  • Step 6: Calculate the current: I ≈ 0.45 A.
  • Power Calculation – Understanding the relationship between power (P), voltage (V), and current (I) using the formula P = VI.
  • Ohm's Law – Applying Ohm's Law to find current when power and voltage are known.
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