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# Circuit Question. watch

1. Could someone check/confirm if I'm understanding this diagram properly.

Am I right in saying;

EMF = 4.5V
Load resistance (R) = 1.5(ohms)
Internal resistance (r) = 6(ohms) and 9(ohms) connected in parallel to each other so, total internal resistance = 3.6(ohms) calculated using 1/Rtotal method.

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2. *diagram in middle right

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3. (Original post by Maguire240)
Could someone check/confirm if I'm understanding this diagram properly.

Am I right in saying;

EMF = 4.5V
Load resistance (R) = 1.5(ohms)
Internal resistance (r) = 6(ohms) and 9(ohms) connected in parallel to each other so, total internal resistance = 3.6(ohms) calculated using 1/Rtotal method.

This was posted from The Student Room's iPhone/iPad App
I think you've got internal and external reversed.
4. Ah, what do you mean?

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5. (Original post by Maguire240)
Ah, what do you mean?

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The clue is in the words internal (i.e. the power sources internal resistance) and external (i.e. the circuit resistance connected externally to the power source).

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