The device used for producing electric current is called
generator
galvanometer
ammeter
motor
Ohm's law gives a relationship between
Current and resistance
Resistance and potential difference
Potential difference and electric charge
Current and potential difference
The magnitude of electric charge is ____.
1.602 ×10−19 C
1.206 ×10−19 C
1.062 ×10−19 C
None
Keeping the potential difference constant, the resistance of a circuit is doubled. The current will become
Double
Half
One-fourth
Four times
SI unit of specific resistance is
Ohm m
ohmm−1
ohmm2
(ohm)−1
The essential difference between AC generator and DC generator is that
AC generator has electromagnet while DC generator has permanent magnet
DC generator generates higher voltage
AC generator generates higher voltage
AC generator has slip rings while DC generator has commutator
The reciprocal of resistivity is called as
Conductivity
Resistance
Current
Voltage
Semi-conductors are used to make the following devices.
Diodes
Transistors
Integrated Circuits
All of these
Which is the best conductor of electricity?
Copper
Aluminium
Silver
Iron
