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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IT0348
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