How would you find internal resistance in part b)ii

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ihaventshowered
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lordaxil
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Using Ohm's law: you need to know the current flowing through power supply (hint: how is this related to value in b(i)?) and voltage drop across power supply (hint: question tells you that most of the p.d. is across the 470 Ohm resistor).
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ihaventshowered
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oh my god thank you
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ihaventshowered
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oh my god thank you
i get that current is 0.031A but what about the voltage PLEASE
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lordaxil
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Yes - current is correct, well done.

If there is 15 V across the power supply with no current flowing, and the voltmeter reads 14.5 V across the 470 Ohm resistor with current flowing, what is the potential drop across the power supply?
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ihaventshowered
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(Original post by lordaxil)
Yes - current is correct, well done.

If there is 15 V across the power supply with no current flowing, and the voltmeter reads 14.5 V across the 470 Ohm resistor with current flowing, what is the potential drop across the power supply?
you are a god how do you understand this
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lordaxil
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I was raised by by wolves and tutored in the dark arts of Kirchoff's laws by Zeus himself.
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