Question

A 10.0 Ω resistor is in parallel with a 20.0 Ω resistor and supplied by a 9.00 V battery. What is the total current passing through the circuit?

1.35 A
0.38 A
1.13 A
6.00 A

Answer 1

I think the answer is 1.35A, but I'm unsure of how that's the answer @Shadow

Answer 2

\[I_{total} = \frac{ V_{total} }{ R_{total}}\]
\[R_{total} = (R^{-1} + R^{-1})^{-1}\]
\[R_{total} = (10^{-1} + 20^{-1})^{-1} = \frac{ 20 }{ 3 } = 6.7 \Omega\]
\[I_{total} = \frac{ 9 }{ \frac{ 20 }{ 3 } } = 1.35 A\]

You were correct :)

Answer 3

@InTheSea