If a 20 and a 40 ohm resistor are wired in parallel to a 20V source, what will be the current in the 40 ohm resistor?
A) 0.33
B) 0.5
C) 1.0
D) 2.0
E) 3.0 amps

Question

Quizplus · Accepted Answer

To find the current in the 40 ohm resistor, we need to use Ohm's Law which states that current (I) = voltage (V) / resistance (R). 
First, we need to find the total resistance of the parallel circuit using the equation: 
1/R(total) = 1/R(1) + 1/R(2)
1/R(total) = 1/20 + 1/40 
1/R(total) = 1/40 
R(total) = 40 ohms

Now, we can use Ohm's Law to find the current in the 40 ohm resistor: 
I = V/R 
I = 20 / 40 
I = 0.5 amps

Therefore, the answer is B) 0.5.

If a 20 and a 40 Ohm Resistor Are Wired