(a) What is the internal resistance of a voltage source if its terminalvoltage drops by 2.00 V when the current supplied increases by 5.00 A?(b) Can the emf of the voltage source be found with the information supplied.

Short Answer

Expert verified

a) Value of resistance of given voltage source is R=0.4Ω.

b) EMF of the given voltage source could not be defined.

Step by step solution

01

Definition of emf and resistance.

Resistance isthe opposition that a substance offers to the flow of electric current. And it is represented by the uppercase letter R.

The maximum potential distance between two electrodes of a cell is the electromotive force of a cell or a cell’s EMF.

02

Calculation of internal resistance and emf of voltage source.

(a)

As relation between current, voltage and resistance is given as:

V=IR

V is the voltage difference, I is the current and R is the resistance.

Now substituting the all the values it gives,

E=IRR=2.00V5.00AR=0.4Ω

Therefore, the internal resistance of a voltage source is R=0.4Ω.

03

Explanation of Can the emf of the voltage source be found with the information supplied.

(b)

EMF of the voltage source cannot be found this way because we are missing information about the total current provided so we could calculate EMF.

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