A level physics electricity Questions

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LeLivre
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I need help answering these questions, they look really simple but I can’t seem to get my head around them


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Hey_Hayley283
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Have u tried searching online? I'm pretty sure u need some sort of equation. Sorry if it doesn't help, I don't study physics as a level
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RogerOxon
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(Original post by LeLivre)
I need help answering these questions, they look really simple but I can’t seem to get my head around them
30: Putting three batteries in parallel acts to decrease the effective internal resistance. The voltage across them (zero current) remains the same. Look at the four answers and calculate the voltage that must be across the 6 Ohm resistor to drive each one of them - you can get the right answer pretty quickly.
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RogerOxon
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(Original post by LeLivre)
I need help answering these questions, they look really simple but I can’t seem to get my head around them
32: This is a potential divider question. The voltage divides in proportion to the resistance, as the current is common to both. The twist is that you need to calculate the resistance of the voltmeter and Y in parallel, before reducing the circuit to a voltage divider.

A shortcut is to see that Y in parallel with the voltmeter will have a resistance of less than R/2. You can discount one of the two answers that satisfy that.
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RogerOxon
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(Original post by LeLivre)
I need help answering these questions, they look really simple but I can’t seem to get my head around them
33: If the reading halves when S is closed, what can you say about the voltage dropped by the internal resistance and the external load?
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Smokestar
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Could you post the answers.
For the first question i got A
2nd i got B
3rd one i got D
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