My Learning Cart
?
Categories
Account

If a 60W bulb operates at 120V, what is the resistance of the bulb?

₹0.0
Login to Download
  • 📥 Instant PDF Download
  • ♾ Lifetime Access
  • 🛡 Secure & Original Content

What’s inside this PDF?

Question: If a 60W bulb operates at 120V, what is the resistance of the bulb?

Options:

  1. 240 ohms
  2. 120 ohms
  3. 60 ohms
  4. 30 ohms

Correct Answer: 120 ohms

Solution: 

Using P = V^2 / R, R = V^2 / P = (120V)^2 / 60W = 240 ohms.

If a 60W bulb operates at 120V, what is the resistance of the bulb?

Practice Questions

Q1
If a 60W bulb operates at 120V, what is the resistance of the bulb?
  1. 240 ohms
  2. 120 ohms
  3. 60 ohms
  4. 30 ohms

Questions & Step-by-Step Solutions

If a 60W bulb operates at 120V, what is the resistance of the bulb?
Correct Answer: 240 ohms
  • Step 1: Identify the power (P) of the bulb, which is 60 watts.
  • Step 2: Identify the voltage (V) at which the bulb operates, which is 120 volts.
  • Step 3: Use the formula for power, which is P = V^2 / R, where R is the resistance.
  • Step 4: Rearrange the formula to solve for resistance (R): R = V^2 / P.
  • Step 5: Substitute the values into the formula: R = (120V)^2 / 60W.
  • Step 6: Calculate (120V)^2, which equals 14400.
  • Step 7: Divide 14400 by 60 to find R: R = 14400 / 60.
  • Step 8: Calculate the result, which is 240 ohms.
  • Ohm's Law and Power Formula – Understanding the relationship between power (P), voltage (V), and resistance (R) in electrical circuits.
Soulshift Feedback ×

On a scale of 0–10, how likely are you to recommend The Soulshift Academy?

Not likely Very likely
Home Practice Performance eBooks