10A

YOUR ANSWER: 120,000 amperes.

Holy mackerel there. What size conductor do you suppose we would have to have to

carry this amount of current?

This is just a little transposition of our basic power formula. We were given a power

consumption of 600 watts from a 200-volt source and asked to solve for current (I). O.K., let's

see how it's done.

a. Correct formula: P = E x 1.

b. 600 = 200 x 1.

c. Divide both sides by 200 thus,

600 = 200 x I. The 200's on the right side cancel each other,

200

200

and we have I = 600 = ?

200

Return to frame 4B and try again.

10B

YOUR ANSWER: E = I x R.

Oh! come on, now. All through this lesson, we have been dealing directly with the basic

power formula. And when we ask you to identify the power formula, you give us E = IR, which

is a variation of Ohm's law.

Let's get serious about this business and pay attention to what you are reading.

Return to frame 16A and select the correct answer.

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