Advertisements
Advertisements
Question
What is an Ohmic resistor?
Advertisements
Solution
Ohmic resistors: The resistors which obey Ohm's law are called ohmic resistors or linear resistances.
Eg: all metallic conductors like silver, aluminium, etc. For such resistors, a graph plotted for the potential difference V against current I is a straight line and the value of resistance R is the same irrespective of the value of V or I.
i.e. V ∝ I
V = IR at constant temperature.
APPEARS IN
RELATED QUESTIONS
The graph between V and I for a conductor is a straight line passing through the origin.
Which law is illustrated by such a graph?
The resistors R1, R2, R3 and R4 in the figure given below are all equal in value.
What would you expect the voltmeter A, B and C to read assuming that the connecting wires in the circuit have negligible resistance?
Fig. represents the circuit used for the verification of ohm's law. Label the different parts from A and F. State the function of each.
The filament of a bulb takes a current 100 mA when potential difference across it is 0.2 V. When the potential difference across it becomes 1.0 V, the current becomes 400 mA. Calculate the resistance of filament in each case and account for the difference.
An ammeter placed in series with an electric radiator reads 0.5 amps and a voltmeter placed across it reads 230 volts. What is the resistance of the radiator?
SI unit of resistance is:
A wire connected to a power supply of 230 V has power dissipation P1. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case, power dissipation is P2. The ratio of `"P"_2/"P"_1` is
What is non ohmic device?
A heater of 220 V heats a volume of water m 5 mint time. A heater of 110 V heat in ten second. The resistance of the conductor is
