Question on: WAEC Physics - 2014
In the circuit diagram above, E is a battery of negligible internal resistance. If its emf is 9.0V. Calculate the current in the circuit ``
A
1.8A
B
1.0A
C
0.8A
D
0.3A
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Correct Option: B
(\frac{1}{r} = \frac{1}{r_1} + \frac{1}{r_2})
= (\frac{1}{5} + \frac{1}{20})
= (\frac{4 + 1}{20} = \frac{5}{20})
r = (\frac{20}{5})
= 4(\Omega)
R = R1 + R2
= 5 + 4
= 9(\Omega)
but V = IR
I = (\frac{V}{R} = \frac{9}{9})
= 1A
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