As compared to thin wires, thick wires have?
Correct answer: C. Less resistance
- A. More resistance
- B. No resistance
- C. Less resistance
- D. Same resistance
Explanation
R = p L/A Thick wires have less resistance than thin wires because of their greater cross-sectional area. The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area, as described by Ohm's law. Thicker wires have a larger cross-sectional area, which means that they offer less resistance to the flow of electric current compared to thinner wires. This is because the larger cross-sectional area provides more space for the electrons to move, reducing the likelihood of collisions and increasing the flow of current. Therefore, thick wires have less resistance than thin wires and can carry more current without overheating or losing energy due to resistance.
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 13 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