Bella.tigerlily
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Report Thread starter 4 months ago
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Can anyone help me out with a couple quite similar questions for physics:

1 - a battery of emf 4v and internal resistance of 1 ohm is connected to a 9 ohm resistor. Calculate the current that flows around the circuit.

2 - 3 identical cells each of emf 2v and internal resistance 0.5 ohm are connected in series to a lamp of resistance 2.5 ohm. What current flows?

I just can’t work out if the internal resistance affects the current. Is the r in v=ir just external resistance or external plus internal?
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Joinedup
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(Original post by Bella.tigerlily)
Can anyone help me out with a couple quite similar questions for physics:

1 - a battery of emf 4v and internal resistance of 1 ohm is connected to a 9 ohm resistor. Calculate the current that flows around the circuit.

2 - 3 identical cells each of emf 2v and internal resistance 0.5 ohm are connected in series to a lamp of resistance 2.5 ohm. What current flows?

I just can’t work out if the internal resistance affects the current. Is the r in v=ir just external resistance or external plus internal?
it's internal plus external resistance
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Bella.tigerlily
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(Original post by Joinedup)
it's internal plus external resistance
Ahh thanks so much!
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