Govt. Exams
Entrance Exams
I = E/(R + r) = 12/(4 + 2) = 12/6 = 2A
1/R_eq = 1/2 + 1/3 + 1/6 = 3/6 + 2/6 + 1/6 = 6/6 = 1. Therefore R_eq = 1Ω
In a purely resistive circuit, voltage and current are in phase, so phase difference is 0°. V = IR is always satisfied
Positive temperature coefficient means R = R₀(1 + αΔT) where α > 0, so resistance increases with increasing temperature
Resistivity is a material property independent of shape and size. It depends only on the nature of material and temperature
Energy = Power × Time = 500W × 4h = 2000Wh = 2 kWh
Standard Leclanche cells have internal resistance in the range of 1-2Ω depending on size and condition
Standard color code: 1st band = first digit, 2nd band = second digit, 3rd band = multiplier, 4th band = tolerance
An ideal ammeter must have zero resistance to not affect the circuit current. In practice, ammeters have very low resistance (mΩ range)
At null deflection: P/Q = R/S, which is equivalent to P·S = Q·R. Both are valid balanced bridge conditions
