Engineering Board Exam Reviewer · Energy and Power · medium
A 60 W, 120 V lamp has what resistance when operating?
- 0.5,
- 120,
- 480,
- 240,
Answer
D. 240,
Solution
R=V2/P=1202/60=240, .
More Energy and Power questions
- If the voltage across a fixed resistor is doubled, the power it dissipates
- A motor takes 1.2 kW from the supply and delivers 1 hp (746 W) at the shaft. What is its efficiency?
- A 12 V battery rated 100 Ah stores how much energy?
- A 100, resistor is rated 12 W. What is the maximum voltage that can be applied across it?
- A 220, resistor is rated 14 W. What is the maximum current it can carry without exceeding its rating?
- A 1500 W heater runs 4 hours a day for 30 days. At P11.50 per kWh, what is the cost?
- The source in the circuit shown is 48 V and the resistor is 12, . How much power does the source deliver?
- A 100, resistor is connected across a 10 V source. What power does it dissipate?
- A 20, resistor carries a current of 0.5 A. How much power does it dissipate?
- A resistor carries 3 A when connected to 12 V. What power does it dissipate?