The resistance of a conductor depends on the:
Length, area of cross-section, material of the conductor, and temperature
The resistance of a conductor is given by \(R = \rho \dfrac{L}{A}\), where L is the length, A is the area of cross-section and \(\rho\) is the resistivity of the material.
Resistance is directly proportional to length and inversely proportional to area of cross-section, and resistivity itself depends on the nature of the material and changes with temperature.
Voltage and current do not determine resistance; by Ohm's law R is the fixed ratio V/I and stays the same even when V and I change together.
"Length and area only" is incomplete, as it ignores the material and temperature.
Hence, resistance depends on length, area of cross-section, material of the conductor, and temperature.
A student constructs a circuit with a battery of 12 V and two resistors of 6 ohms and 4 ohms connected in series. What is the total current flowing through the circuit according to Ohm's Law?
If the power consumed by a bulb is 60 W and the voltage across it is 120 V, what is the resistance of the bulb?
Which of the following graphs best represents Ohm’s Law for a resistor at constant temperature?
What is the function of the cartridge (such as porcelain) encasing the fuse wire?
What does the given symbol represent in an electric circuit diagram?
Suppose a household replaces all 5 A sockets with 15 A sockets and connects multiple high-power appliances to each. What potential risk does this introduce, and why?
Electric fuses are used in household circuits primarily to ___________.
A student sets up two circuits: Circuit X uses a thin, long copper wire, and Circuit Y uses a thick, short copper wire, both connected to identical batteries. Which circuit will have a higher resistance, and why?
In a circuit, two resistors R₁ and R₂ are connected in parallel. If R₁ = 4 Ω and R₂ = 12 Ω, and the total voltage across the parallel combination is 6V, what is the total current flowing in the circuit?
If a resistor is connected across a battery and used for a longer time period, which of the following will increase, assuming current and resistance remain constant?
Which of the following is a bad conductor of electricity?
In general, in an alternating current circuit
The laws of electromagnetic induction have been used in the construction of a
A 220 volt and 100 watt bulb is connected to a 110 volt source. The power consumption by the bulb is
Which of the following statement is correct?
I. 1 kWh = 3.6 × 10 6J.
II. The SI unit of electric current is the ampere.