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 series
Author: Aroma Ann
An instrument which detects electric current is known as __________?
A. voltmeter
B. rheostat
C. wattmeter
D. galvanometer
Varistors are __________?
A. insulators
B. non-linear resistors
C. carbon resistors
D. resistors with zero temperature coefficient
Which is the best conductor of electricity?
A. Iron
B. Silver
C. Copper
D. Carbon
Which of the following material has nearly zero temperature co-efficient of resistance?
A. Manganin
B. Porcelain
C. Carbon
D. Copper
The resistance of a conductor varies inversely as __________?
A. length
B. area of cross-section
C. temperature
D. resistivity
Electric pressure is also called __________?
A. resistance
B. power
C. voltage
D. energy
The filament of an electric bulb is made of __________?
A. carbon
B. aluminum
C. tungsten
D. nickel
Insulating materials have the function of __________?
A. preventing a short circuit between conducting wires
B. preventing an open circuit between the voltage source and the load
C. conducting very large currents
D. storing very high currents
