Using the data on the diagram below, calculate the potential difference across the 20- Ω...
PHYSICS
WAEC 1999
Using the data on the diagram below, calculate the potential difference across the 20- Ω resistor. (Neglect the internal resistance of the cell)
- A. 5V
- B. 10V
- C. 20V
- D. 60V
Correct Answer: D. 60V
Explanation
Voltage across 5Ω resistor = IR = 2 × 5 = 10V
Since voltage in a parallel connection is the same, voltage across 10Ω is also 10V
Current flowing across the 10Ω resistor
I = V/R = 10/10
Current I= 1A
Total current flowing = 2 + 1 = 3A
Voltage across 20Ω resistor = IR
= 3 × 20
= 60V
Post an Explanation Or Report an Error
If you see any wrong question or answer, please leave a comment below and we'll take a look. If you doubt why the selected answer is correct or need additional more details? Please drop a comment or Contact us directly. Your email address will not be published. Required fields are marked *