(a) What is the current in a 5.60-ohm resistor connected to a battery that has a 0.200-internal resistance if the terminal voltage of the battery is 10.0V? (b) What is the emf of the battery?

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2 Answers

Atul Chhotray Profile
Atul Chhotray answered
VT = Terminal Voltage, Rexternal = 5.6 ohms, Rinternal = Ri = 0.2 ohms
Let the current in the circuit be I amperes.

(1) VT = I Rexternal => I = VT / Rexternal = 10 / 5.60 = 1.786 A

(2) Let the EMF of the battery be denoted by E.

VT = E - I * Ri
=> E = VT + I * Ri  = 10 + (1.786 * 0.2) = 10 + 0.357 = 10.357 V
Jeff Hardiz Profile
Jeff Hardiz answered

This is solved by the terminal Voltage VI , Rexternal, Ri..

We use this formula :

VT / Rexternal by putting values we get 1.786 A current.

Now we find EMF of a battery:

VT = EMF - I * Ri and rearrange this formula!

EMF = VT + I * Ri

We get the EMF of a battery around 10.357 V..

Try this ohm calculator app through which you can easily came to know about the calculations of voltage,current and resistance.

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