When an a.c. voltage is applied to a capacitor; no power is consumed because the current?
A. leads the voltage by 90° B. lags behind the voltage by 90° C. and voltage are in phase D. and voltage are 180° out of phase Correct Answer: Option A = leads the voltage by 90° Explanation In a capacitive circuit, current leads voltage by 90°, or voltage lags...If the capacitance of an capacitor is C = (εA)/d; which of the following parameters is varied when a variable capacitors is used for tuning radio sets?
A. constant (ε) and area B. area and distance. C. constant (ε) only D. distance only Correct Answer: Option B – area and distance.
An electric heater with a p.d of 240 V connected across its terminals has a total resistance of 960Ω. find the power rating of the heater.
A. 0.25 W B. 4.00 W C. 38.40W D. 60.00W Correct Answer: Option D = 60.00W Explanation Electrical power = IV or I²R or (V)/R With V = 240v, R = 960Ω Power (V²)/R = (240 X 240)/960 =60Watts
The main purpose of the transformer in an a.c radio set is to?
A. increase power to the radio B. step up the voltage C. convert energy from a.c to d.c D. step down the voltage Correct Answer: Option D = step down the voltage
An immersion heater rated 2.0A; 240V is used to boil water from temperature 52°C to 100°C. If the mass of the water is 2.5kg. determine the time taken to boil the water. [specific heat capacity of water = 4.2 x 10³ jkg−¹ k−¹ ]
A. 1.05 x 103s B. 1.05 x 105s C. 1.05 x 102s D. 1.05 x 104s Correct Answer: Option A = 1.05 x 103s Explanation Power of heater = lvt = 2 x 240 x t heat required to boil the water = Mct = 2.5 x 4.2 x 103 x (100.52) = 2.5 x 4. 2 x 103 x 48 2 x 240 x t = 2.5 x 4.2 x 103...Products
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