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Question
Find the value of current I drawn from the cell.
- Calculate the current I.
- Calculate the terminal voltage.
Numerical
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Solution
a. External resistance = `[(30xx30)/(30+30)]`
= 15 Ω
Internal resistance = 2 Ω
By Ohm's law,
E = I(R + r)
3.4 = I(15 + 2)
I = `3.4/17`
= 0.2 A
b. For Terminal voltage,
V = E - ir
= 3.4 - (2 × 0.2)
= 3V
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