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Mathematics 7 Online
OpenStudy (anonymous):

A walkman uses a current of 2.0 A and has an internal resistance of 3.0 Ω, how many 1.5V batteries are required.

OpenStudy (anonymous):

ahh what's the formula again?

OpenStudy (anonymous):

V = IR

OpenStudy (anonymous):

okay so whats V = IR from what you're given? Ignore the 1.5V for now

OpenStudy (anonymous):

Given I = 2, R = 3

OpenStudy (anonymous):

what V do you get from that?

OpenStudy (anonymous):

i got 6V. I think its wrong

OpenStudy (anonymous):

no that's right, since 2 * 3 = 6 Okay so now you have 6V which is the amount of battery used by the walkman

OpenStudy (anonymous):

So how many 1.5V batteries you need to make it equal 6V?

OpenStudy (anonymous):

4 i think

OpenStudy (anonymous):

there you go :) 1.5 * 4 = 6

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