3A
YOUR ANSWER: Power = work.
time
Right.
The unit of measurement for electrical power is the WATT. One watt: of power equals
the work done in one second by one volt of potential difference in moving one coulomb of
charge. Since one coulomb per second is an ampere, power in watts equals the product of
amperes times volts. Thus:
Power in watts = volts x amperes
or
P = E x I.
Where P is power in watts, E is voltage and I is the intensity of current flow.
The watt then is:
the time rate for doing electrical work.
frame 1B
the time rate for consuming electrical energy.
frame 6A
both the above.
frame 5A
3B
YOUR ANSWER: 100 watts.
Our response. How come?
You have already solved a similar problem, using the formula P = E x I, or you couldn't
have gotten to the preceding page. Once more, P = E x I, NOT P = IR.
With the formula P = E x I firmly in your mind, return to frame 4A and solve for the
correct answer.
IT0348
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