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Questions:

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