Q85 three resistor are connected in parallel total resistance is 5 ohm if p.d across first resistance is 20V then the potential diff of 2nd resistance will be I1=10A,I2=200A,I3=15A?
Ans is 20V
What are you talking about? If they are wired in parallel then the voltage is the same across each.
To find the potential difference (V) across the second resistor in a parallel circuit, we can use the formula:
V = I * R
Where V is the potential difference, I is the current flowing through the resistor, and R is the resistance of the resistor.
Given the current values for each of the resistors (I1 = 10A, I2 = 200A, I3 = 15A) and the total resistance of the parallel circuit (5 ohms), we need to determine the resistance of each individual resistor.
In a parallel circuit, the total resistance (Rp) can be calculated using the formula:
1/Rp = 1/R1 + 1/R2 + 1/R3
Where R1, R2, and R3 are the resistances of each individual resistor.
Given that the total resistance (Rp) is 5 ohms, we can rearrange the formula to find the combined resistance (Rp):
1/5 = 1/R1 + 1/R2 + 1/R3
Now, substituting the current (I) and resistance (R) values that we know into the formula for potential difference (V = I * R), we can find the potential difference (V2) across the second resistor:
V2 = I2 * R2
To find the value of R2, we need to solve the equation:
1/5 = 1/R1 + 1/R2 + 1/R3
Given that R1 = 20V, we can calculate R1 as:
R1 = (V1/I1) = (20V/10A) = 2 ohms
Substituting R1 = 2 ohms into the equation for total resistance:
1/5 = 1/2 + 1/R2 + 1/R3
We are missing information for R3, so we cannot determine the exact values for R2 and R3 at this point. Therefore, we won't be able to calculate the potential difference across the second resistor (V2) based on the given information.
Please provide the value of the current (I3) or the resistance (R3) of the third resistor so we can proceed with the calculation.