12A

YOUR ANSWER: (A) P = 50,000 watts. (b) P = 1,000,000 watts.

Wrong. But let's see why you are wrong.

First, you did not use the correct formula. With voltage and resistance known, we use

the formula P = E2, not P = E, which you used in both problems.

R

R

Problem (A)

P = E2

R

P = 5 x 50

1000

P = 2500

1000

P= ?

P = E2

R

Problem (B)

P = E2

R

P = 100 x 100

10,000

P = 10,000

10,000

P=

Complete these problems; then continue on to frame 16A.

12B

YOUR ANSWER: (a) 93.25 watts. (b) .11 horsepower.

You are not correct.

First of all, P = E x I, not P = E

I

You have solved for horsepower correctly; however, let's try again.

a. P=E x l

b. P - 373 x 4 = ? watts

c. HP = ?

watts

=

hp.

746 (watts/hp)

After solving this problem correctly, continue on to frame 17A.

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