In the circuit diagram above, the three resistors have different resistance with
ID: 1768887 • Letter: I
Question
In the circuit diagram above, the three resistors have different resistance with the value for each resistor given below. The wires connecting the battery and resistors have negliglible resistance.
1. The resistance R3 = 20.0 ?, R2 = 40.0 ? and R1 = 5.0 ?. The battery supplies 12.0 V. Assume that the battery has no internal resistance.
What is the current following through R3?
2. What is the current following through R2?
3. What is the current following through R1?
4. What is the current following out of the battery?
5. What is the voltage across the resistor R3?
Explanation / Answer
Since, all the resistances are connected in parallel, potential difference across all of them is equal to 12.0V
a)
IR3 = V/ R3 = 12/ 20 A = 0.6 A
b)
IR2 = V/R2 = 12/ 40 A = 0.3 A
c)
IR1= V/R1 = 12/ 5 A = 2.4 A
d)
Total current, I = IR1 +IR2 +IR3 = 2.4 + 0.3 + 0.6 A = 3.3 A
e)
Potential difference across R3 = 12 V (Its ends are directly connected to the battery