The p.d across a 3 Ω resistor is 6 V. The current flowing in the resistor will be ……………………..
A) 1/2A
B) 3A
C) 2A
D) 6A
1 Answers
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The charge flowing throug a conductor beginning with time to=0 is given by the formula `q=2t^(2)+3t+1` (coulombs). Find the current `i=(dq)/(dt)` at t
Correct Answer - 23 Amp.
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If the potential difference in a circuit is 240 V and the resistance is 60 Ω then the current flowing through the circuit is …………………….
Correct option is A) 300 A
2 Answers 2 views
A metal wire of radius 0.4 mm carries a current of 2 A. Find the magnitude of current density if the current is assumed to be uniformly distributed
Given: r = 0.4 mm = 0.4 × 10-3 m, I = 2 A To find: Current density (J) Formula: J = \(\frac{I}{A}\) Calculation: From formula, J = \(\frac{2}{3.142\times(0.4)^2\times10^{-6}}\) = 3.978 × 106 A/m2
2 Answers 134 views
Prove that power dissipated across a resistor is responsible for heating up the resistor. Give an example for it.
i. When a charge Q flows from the higher potential point to the lower potential point, its potential energy decreases by an amount, ∆U = QV = I∆tV where I is current...
2 Answers 1 views
Calculate the current flowing through a heater rated at 2 kW when connected to a 300 V d. c. supply.
Given: P = 2 kW = 2000 W, V = 300 V To find: Current (I) Formula: P = IV Calculation: From formula, I = \(\frac{P}{V}=\frac{2000}{300}\) = 6.67 A
2 Answers 1 views
From the given value of resistor, find the colour bands of this resistor.
Value = 330 Ω = 33 × 101 Ω = xy × 10z Ω Value 3 3 1 Colour Orange (x) Orange (y) Broen(z) ii. Given: Green – Blue – Red – Gold
2 Answers 1 views
A battery of e.m.f. 10 V and internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A
Given: E = 10 V, r = 3 Ω, I = 0.5 A To find: i. Resistance of resistor (R) ii. Terminal voltage of battery (V) Formula: I = \(\frac{E}{R+r}\) Calculation: From formula, R = \(\frac{E}{I}-r\) ∴...
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The drift velocity of free electrons in a conductor is vd, when the current is flowing in it. If both the radius and current are doubled
Correct option is: (C) \(\frac{v_d}{2}\)
2 Answers 2 views
A cell of emf E and internal resistance r is connected across an external resistance R (R >> r). The p.d. across R is
Correct option is: (B) E(I – \(\frac{r}{R}\))
2 Answers 1 views
The method in which crops are planted in alternating strips across a slope or across the path of the prevailing wind is……
B) Contour strips
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