Three resistors of 6 ohms each, can be connected in all possible ways. The highest value of resistance that can be obtained (in ohms) is:
Correct answer: D. 18 Ohms
- A. 2 Ohms
- B. 4 Ohms
- C. 9 Ohms
- D. 18 Ohms
- E. 36 Ohms
Explanation
If we connect all three in series, combined resistance will be 6+6+6=18(Series combination always gives the highest combined resistance)If we connect all three in parallel, combined resistance will be 1/6 + 1/6 + 1/6 = 1/R so R = 2 Ohms(This is the lowest possible combined resistance)This cancels options A, B, C and E since the highest possible resistance must be equal 18 Ohms.
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
Two lamps are connected in series to a 250 V power supply. One lamp is rated 240 V, 60 W, and the other rated 10 V, 2.5 W. Which statement most accurately describes what happens?
A cell of internal resistance 2.0Ω and electromotive force (e.m.f) 1.5V is connected to a resistor of resistance 3.0Ω. What is the potential difference across the 3.0Ω resistor?
When will 1 C of charge pass a point in an electrical circuit?
The temperature coefficient of a semiconductor is negative because:
Ohm's law applies to:
In a series circuit, current remains?