An 80 resistance connected to a battery with internal resistance draws 1.6 A, and if a 300 resistance is connected to the same battery it draws 0.5A. What is the current drawn by a 60 resistance from this battery?
Correct answer: A. 2A
- A. 2A
- B. 2.5 A
- C. 2.2 A
- D. None of above
Explanation
Set up two equations using V = E - Ir for the two conditions to solve for the battery's EMF (E) and internal resistance (r). Once E and r are known, use the same formula to find the current (I) when a 6Ω resistor is connected, which correctly calculates to 2A.
Last updated
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.
Exams that ask Physics questions like this
Physics is on 15 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
0.75 A current flows through an iron wire when a battery of 1.5 volts is connected across its ends. The length of the wire 5.0 m and its cross-sectional area is 2.5 x 10^-7 m2. What is the resistivity of iron?
1.6 mA current is flowing in conducting wire then the number of electrons flowing per second
1 kilo ohm = _ ohm
1 microvolt is
1/Req = 1/Rl + 1/R2 + 1/R3 + ..... +1/Rn is the combination in