# Electricity physics question help? :( Watch

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What is the maximum current that 12 cells, each of emf 2.0 V and internal resistance 0.6 ohms, can produce in a resistor of 0.80 ohms?

The answer is 5 A.

I’m not sure how to do this question because I thought it’d be a simple V=IR equation and then multiplying the final answer by 12 but I do not seem to get 5 amps.

Help is much appreciated

The answer is 5 A.

I’m not sure how to do this question because I thought it’d be a simple V=IR equation and then multiplying the final answer by 12 but I do not seem to get 5 amps.

Help is much appreciated

Last edited by Montenzuma; 3 weeks ago

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#2

What resistance are you plugging in for R in your V=IR equation?

(also it helps if you say what level this is for, e.g. GCSE/A-level/degree level etc ).

(also it helps if you say what level this is for, e.g. GCSE/A-level/degree level etc ).

Last edited by artful_lounger; 3 weeks ago

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(Original post by

What resistance are you plugging in for R in your V=IR equation?

(also it helps if you say what level this is for, e.g. GCSE/A-level/degree level etc ).

**artful_lounger**)What resistance are you plugging in for R in your V=IR equation?

(also it helps if you say what level this is for, e.g. GCSE/A-level/degree level etc ).

I would plug in the 0.8 resistor value

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(Original post by

Hi, this is for Advanced level physics

I would plug in the 0.8 resistor value

**Montenzuma**)Hi, this is for Advanced level physics

I would plug in the 0.8 resistor value

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#5

**Montenzuma**)

Hi, this is for Advanced level physics

I would plug in the 0.8 resistor value

You also don't seem to have accounted for the internal resistance there. I assume all cells and the resistor are connected in series? While I'm pretty rusty I don't actually get 5A either if the cells and resistor are in series though, although it's been quite a few years since I had to do any of this

Last edited by artful_lounger; 3 weeks ago

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(Original post by

What is the maximum current that 12 cells, each of emf 2.0 V and internal resistance 0.6 ohms, can produce in a resistor of 0.80 ohms?

The answer is 5 A.

I’m not sure how to do this question because I thought it’d be a simple V=IR equation and then multiplying the final answer by 12 but I do not seem to get 5 amps.

Help is much appreciated

**Montenzuma**)What is the maximum current that 12 cells, each of emf 2.0 V and internal resistance 0.6 ohms, can produce in a resistor of 0.80 ohms?

The answer is 5 A.

I’m not sure how to do this question because I thought it’d be a simple V=IR equation and then multiplying the final answer by 12 but I do not seem to get 5 amps.

Help is much appreciated

How else can you arrange the cells?

Last edited by RogerOxon; 3 weeks ago

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#7

(Original post by

What is the maximum current that 12 cells, each of emf 2.0 V and internal resistance 0.6 ohms, can produce in a resistor of 0.80 ohms?

The answer is 5 A.

I’m not sure how to do this question because I thought it’d be a simple V=IR equation and then multiplying the final answer by 12 but I do not seem to get 5 amps.

**Montenzuma**)What is the maximum current that 12 cells, each of emf 2.0 V and internal resistance 0.6 ohms, can produce in a resistor of 0.80 ohms?

The answer is 5 A.

I’m not sure how to do this question because I thought it’d be a simple V=IR equation and then multiplying the final answer by 12 but I do not seem to get 5 amps.

0

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Report

#8

**Montenzuma**)

What is the maximum current that 12 cells, each of emf 2.0 V and internal resistance 0.6 ohms, can produce in a resistor of 0.80 ohms?

The answer is 5 A.

I’m not sure how to do this question because I thought it’d be a simple V=IR equation and then multiplying the final answer by 12 but I do not seem to get 5 amps.

Help is much appreciated

^{2}R) out of a supply when the external resistance is equal to the internal resistance. Put the cells into 4 groups of 3 parallel cells and then put these groups in series. This gives you?

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