Asked by Anonymous
You have an LED bulb that uses 4 watts of power and gives an output of 170 lumens. The operating voltage is 120 volts. Using this data, find the following.
1. What is the current that the LED bulb uses?
Ans. 0.03 ampere
2. What is the effective resistance of this bulb?
I'm not sure what they mean by effective resistance, but I found the resistance to be 4000 ohms.
3. How much does it cost to use this bulb for 2 hours at a rate of $0.12/kWh?
Ans. $0.00144
1. What is the current that the LED bulb uses?
Ans. 0.03 ampere
2. What is the effective resistance of this bulb?
I'm not sure what they mean by effective resistance, but I found the resistance to be 4000 ohms.
3. How much does it cost to use this bulb for 2 hours at a rate of $0.12/kWh?
Ans. $0.00144
Answers
Answered by
Damon
1. agree Power = Voltage* current
so i = P/V = 4/120 = .0333 amps
2. R = V/i = V*2/P = 3600 ohms
3. Power * time = energy used
= 4 * 2 = 8 watt hours = .008 kwhr
.008*.12 = .00096 dollars
so i = P/V = 4/120 = .0333 amps
2. R = V/i = V*2/P = 3600 ohms
3. Power * time = energy used
= 4 * 2 = 8 watt hours = .008 kwhr
.008*.12 = .00096 dollars
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.