Energy and Power Flashcards
1
Q
The work done in a resistor can be investigated experimentally using a ____.
A
Calorimeter
2
Q
How can the work done be derived mathematically?
A
W=VQ
3
Q
Explain how W=VQ can also be written as W=I^2Rt.
A
W=VQ (Q=It)
W=VIt (V=IR)—> Ohm’s law
W=(IR)xIT
W=I^2Rt
4
Q
Define Power.
A
It is the rate at which work is done.
5
Q
What is the formula for power?
A
P=W/T
6
Q
P= power in \_\_\_\_ (W) W= work in \_\_\_\_ (J) t= time in \_\_\_\_ (s)
A
Watts
Joules
Seconds
7
Q
Energy = ____
A
Pt
8
Q
We pay for electricity in our homes. The cost is not expressed in joules but in ___. This unit is obtained by expressing the power (P) in ____ and time in ___.
A
kWh
kilowatts
hours
9
Q
How can W=I^2Rt also be written?
A
W=V^2t/R
10
Q
How can P=I^2R also be written?
A
P=V^2/R
