Chapter 4 : Assignment 1

For a printable version of this Chapter 4 Assignment 1

Q no.1: What maximum voltage can be connected across a 0.5-W 270-Ω resistor without exceeding the rated power dissipation?

Q no.2Repeat exercise 3.24 for each of the following.

(a) R=510Ω,V=10V

(b) R=470Ω, I=1.95mA

(c) R=3.3Ω, V=50V

(d) V=50mA, I=0.2A

Q no.3: find the nominal resistance value and the possible resistance range of resistors having each of the following color codes,

(a) Green , blue, red, silver

(b) Brown, black , yellow , gold

(c) Brown, red, brown, gold

(d) Orange , orange, green , silver

Q no.4Find the nominal resistance value and the possible resistance range of resistors having each of the following color codes.

(a) Grey , red, red, gold

(b) Brown, black, green, silver

(c) Orange, white, black, silver

(d) Red, red, red

Q no.5Write the color code corresponding to each of the following resistor values.

(a) 470 Ω ± 5%

(b) 1.8 kW ± 10%

(c) 820 kW ± 20%

(d) 1.5 MW ± 5%

Q no.6Find the minimum possible conductance of 4.7 K-ohm resistor having 5% tolerance.

Q no.7Derive an expression for power dissipated in the resistor in terms of its conductance G and the current I through it.

Q no.7Derive an expression for the power dissipated in the resistor in terms of its and the voltage V across it.

Q no.8when a certain electric motor is operated for 30 min, it consumes 0.75 kWh of energy. During that time, its total energy loss is 3*10^5 J.

(a) What is the efficiency of the motor?

(b) How many joules of work does it perform in 30min?