25A

1. In our study of electrical power, we found that the unit of

measurement for electrical power is the _____________.

ANSWERS

1. watt

2. The time rate for consuming energy is _____________.

2. power

3. The basic power formula is P =

x __________.

3. P = E x I

4. If current and power in a circuit were known, you could solve for

voltage by using the formula E = ________________________.

4. E = P

5. In a circuit where voltage and power are known, you could solve for

I

voltage by using the formula I = _______________________.

5. I = P

6. We have two formulas with which to express power in watts in terms

E

of resistance; they are:

for current, P = ___________________.

for voltage, P = ___________________.

6. current, P= I2R

7. Write the three formulas for power.

voltage, P=E2

P= __________ P= __________ P= __________

R

7. P = E x I

8. The ratio of power output to power input is called

P =I2R

_________________________.

P=E

2

R

8. efficiency

9. Efficiency is the ratio of power

. to

power ______________________.

9. output

Now, if you feel you are ready, continue on to the examination.

input

IT0348

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