Adaptive Practice
Current Electricity
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⏱ 0:30
Easy
What is the SI unit of electrical resistance?
Easy
Which of the following materials has the highest electrical conductivity?
Easy
In a series circuit with resistors R1 = 2 Ω, R2 = 3 Ω, and R3 = 5 Ω, what is the total resistance?
Medium
If a wire of length L and cross-sectional area A has resistance R, what will be the resistance of a wire of length 2L and area A/2 made of the same material?
Medium
What is the drift velocity of electrons in a copper wire carrying a current of 3 A? (Number density of electrons n = 8.5 × 10^28 m^-3, cross-sectional area A = 1 mm², charge of electron e = 1.6 × 10^-19 C)
Medium
A wire of resistivity ρ and length L is stretched to double its length. What will be the new resistivity?
Medium
In a Wheatstone bridge, if all four resistors are equal, what is the potential difference between the midpoints?
Medium
A cell of emf 12 V and internal resistance 1 Ω is connected to a resistor of 5 Ω. What is the terminal voltage of the cell?
Hard
Two resistors R and 3R are connected in parallel. What is the equivalent resistance?
Hard
A potentiometer wire of length 1.5 m is connected across a 3 V battery. What is the potential gradient along the wire?