If V is the voltage, R is the resistance and I is the current then the equation for electric power is …………………….
A) V2/R
B) IR
C) V2R
D) V/I
1 Answers
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The internal resistance of a cell of emf 2 V is 0.1 Ω, it is connected to a resistance of 0.9 Ω. The voltage across the cell will be
Correct answer is (B) 1.8 V
2 Answers 3 views
A resistance thermometer has resistance 95.2 Ω at the ice point and 138.6 Ω at the steam point. What resistance would be obtained
Here the thermometric property P is the resistance. If R is the resistance at 27 °C, Using equation, T = \(\frac{100(P_T-P_1)}{(P_T-P_1)}\) For T = 27 °C, P1 = 95.2 Ω, P2 = 138.6 Ω . ∴ 27 = \(\frac{100(R-95.2)}{(138.6-95.2)}\) ∴...
2 Answers 3 views
An electric bulb of 360 Ω resistance is connected to a 6 V battery. The power consumption is ………………………
Correct option is A) 0.1 W
2 Answers 4 views
Electric eel is capable of generating power electric shocks of up to
B) 600 volts
2 Answers 1 views
If ΔΦ/Δt is the rate of change of flux and I is the current then the electric power is …………….
B) I. (ΔΦ/Δt)
2 Answers 1 views
An electric heater takes 6 A current from a 230 V supply line, calculate the power of the heater and electric energy consumed by it in 5 hours.
Given: I = 6 A, V = 230 V, t = 5 hours To find: Power (P), Energy consumed Formulae: i. P = IV ii. Energy consumed = power × time Calculation: From formula...
2 Answers 1 views
When supplied a voltage of 220 V, an electric heater takes 6 A current. Calculate the power of heater and electric energy consumed by its in 2 hours?
Given: I = 6 A, V = 220 volt, t = 2 hour To find: i. Power of heater (P) ii. Electric energy consumed (E) Formulae: i. P = IV ii. Electric energy consumed =...
2 Answers 1 views
A piece of platinum wire has resistance of 2.5 Ω at 0 °C. If its temperature coefficient of resistance is 4 × 10^-3/°C. Find the resistance
Given: R0 = 2.5 Ω α = 4 × 10-3/°C = 0.004/°C T = 80 °C To find: Resistance at 80 °C (RT) Formula: RT = R0(l + αT) Calculation: From formula, RT = 2.5 [1+ (0.004 × 80)] =...
2 Answers 3 views
The internal resistance of a cell of emf 2 V is 0.1 Ω. It is connected to a resistance of 3.9 Ω. The voltage across the cell will be
Correct option is: (C) 1.95 V
2 Answers 1 views
The supply voltage to room is 120 V. The resistance of the lead wires is `6Omega`. A 60 W bulb is already switched on. What is the decrease of voltage
Correct Answer - D `P=(V^(2))/(R)`
2 Answers 2 views