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Standard VII
Physics
Symbols of Electric Components
what is diffe...
Question
what is difference between resistance and resistor
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Q.
(a) What is meant by the "resistance of a conductor" ? Write the relation between resistance, potential difference and current.
(b) When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Calculate the value of the resistance of the resistor.
Q.
The values of current (I) flowing through a given resistor of resistance (R), for the corresponding values of potential difference (V) across the resistor are given below :
V (volts)
0.5
1.0
1.5
2.0
2.5
3.0
4.0
5.0
I (amperes)
0.1
0.2
0.3
0.4
0.5
0.6
0.8
1.0
Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor.
Q.
The potential difference between the terminals of a battery of emf 6.0 V and internal resistance 1 Ω drops to 5.8 V when connected across an external resistor. Find the resistance of the external resistor.
