1.
2.
3.
4.
5.
Plot P versus R in Fig. 3 from Table-2.
R
P
Figure. 3: P versus R
Comment on the linearity of R as P increases.
Referring to Table 2 resistor operates in the linear region or non-linear region? Explain by
considering the power rating of the resistor.
An electric heater takes 1.5 kW from a voltage source of 120 V. Find the resistance of the
heater.
If the current in a resistor doubles, what happens to the dissipated power? (Assume the
resistor operates in the linear region).
A 5 resistor has to be used in a circuit where the voltage across the resistor is 4V. If two
5 resistors with 3 W and 4 W power ratings are available, which will you use and why?/nTable 1. Resistor values:
Resistor
Nominal value / Tolerance
Ohm Meter reading (K S2)
Voltage (V)
Current (1)
V/I(ΚΩ)
V (volt)
I (mA)
R (Ohm) = V/I
P (Watt)
Table 2. Power Rating: (R = 47002, 1W)
6
12.80
0.468
0.0768
R=100 Ohm
100 ohm
0.103 ohm
9.96V
97.2mA
102 ohm
10
15
31.39 32.13
0.318
0.466
0.3139 0.481
20
42.8
0.467
0.856
Fig: 1
Fig: 2