EMF becomes equal to the terminal potential difference when the:
Correct answer: C. Circuit is open
- A. Circuit is closed
- B. Current is max
- C. Circuit is open
- D. All of these options are correct
Explanation
EMF is equal to the terminal potential difference when no current flows i.e. the circuit is open. The EMF (electromotive force) is the potential difference between the terminals of a battery when no current is flowing through an external circuit when the circuit is open. Terminal potential difference is the voltage across the terminals of the battery when the current is being drawn from it. The potential difference between the terminals of a battery will equal the EMF of the battery when there is no current in the battery. At this time the potential drop across the internal resistance is 0.
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
A battery of 12 volts is connected to three resistors of 4 Ohm, 5 Ohm and 3 Ohm joined together in parallel. The current through the 3 - Ohm resistances is _.
The reciprocal of conductance is called:
If a 2-ampere current is drawn from the battery in 10 minutes, how much charge will flow through the circuit in this time?
Ohm's law is applicable to _.
The length and radius of an electric resistance of a certain wire are doubled simultaneously, then the:
How much potential difference is required for establishing steady current?