Verified answer

First you have to find the total resistance of the five 4.0Ω resistors.

Let's 'pair' up the resistors and figure it out...

Resistor A (4Ω) in parallel with Resistor B (4Ω) equals 2Ω. (Resistor AB)

Resistor C (4Ω) in parallel with Resistor D (4Ω) equals 2Ω. (Resistor CD)

Resistor AB (2Ω) in parallel with Resistor CD (2Ω) equals 1Ω (Resistor ABCD).

Now we have a 1Ω resistor (ABCD) in parallel with a 4Ω resistor (E)

R(total) = (1 * 4) / (1 + 4) = 4/5Ω or 0.8Ω

The *total* current is 20V / 0.8Ω = 25 amps.

25 amps divided into five parallel resistors equals (you crunch the numbers).

Best of luck in your studies,

~ Mitch ~

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I = V/R

The voltage across any one resistor is 20V

I = 20/4 = 5A

m07232012