A 2.1W iPod is used for 30 minutes. How much energy does it use? (3
2 answers:
Answer:
Energy used, E = 3780 Joules
Explanation:
It is given that,
Power, P = 2.1 W
Time, t = 30 minutes = 1800 seconds
We need to find the energy used by the iPod. The product of power and time is called energy used i.e.
E = P × t
E = 3780 Joules.
So, the energy used by the iPod is 3780 Joules. Hence, this is the required solution.
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Answer:
14.16 W
Explanation:
We have given impedance Z=91.5 ohm
Voltage across the resistor = 36 V
We have to find the power delivered by the source
We know that according to telegens theorem , the absorbed = power delivered
So the voltage across the resistor = 36 V
Current in the RLC circuit this current will be same in the whole circuit as it is a series RLC circuit
Now the power absorbed by the resistor
As the power absorbed = power delivered
So power delivered by the source =14.16 W