Find the resistance if the voltage of a circuit is 45 volts and the current is 30 amperes.
Correct answer: B. 1.5 Ohms
- A. 1.6 Ohms
- B. 1.5 Ohms
- C. 1.7 Ohms
- D. 1.8 Ohms
Explanation
We know that V = IRRearranging this formula gives:R= V/I= 45/30= 3/12= 1.5 OhmsAs it is numerical so it can have only one possible answer.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Current Electricity
Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
Practise Current Electricity
1,052 free Current Electricity MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Current Electricity questions
The change in resistance of metallic conductor at a temperature below 0 degrees is:
If a resistor having resistance 'R' is cut into three equal parts, then the equivalent of a parallel combination is:
If a voltage of 9V is applied between the ends of a wire whose resistance is 0.2 ohm, what will be the resulting current?
A galvanometer is an:
For a metallic wire, the ratio V/I (V = applied potential difference, I = current flowing):
When a conductor of a cross-sectional area 5 x 10^-6 m2 carries a current of 6 A, the drift velocity of the conduction electrons is 1.2 x 10^-4 ms-1. What is the number density (number per unit volume) of the conduction electrons?