A closed switch has a resistance of_____________?
A closed switch has a resistance of_____________?
A. zero
B. about 50 ohms
C. about 500 ohms
D. infinity
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You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect__________?
You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect__________?
A. two in parallel
B. two in parallel and one in series
C. three in parallel
D. three in seriesAll of the following are equivalent to watt except_____________?
All of the following are equivalent to watt except_____________?
A. (amperes) ohm
B. joules/seC.
C. amperes x volts
D. amperes/voltCopper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?
Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?
A. 1/9 times
B. 3 times
C. 9 times
D. unchangedTwo lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct ?
Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct ?
A. 100 W lamp will glow brighter
B. 40 W lamp will glow brighter
C. Both lamps will glow equally bright
D. 40 W lamp will fuseInductor does not allow the sudden change of
Inductor does not allow the sudden change of
A. current
B. voltage
C. power
D. None of the aboveVoltage developed across an inductor is expressed bY
Sudden change of current means di will change at dt → 0 (dt tends to zero), so sudden change of current means infinite voltage. Therefore it is not possible.Varistors are______________?
Varistors are______________?
A. insulators
B. non-linear resistors
C. carbon resistors
D. resistors with zero temperature coefficient