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Fundamentals of Electric Circuits-Solution Manual [EXP-4823]

187 SOLVED PROBLEMS

Question: 2.70

(a) Consider the Wheatstone Bridge shown in Fig. 2.130. Calculate va, vb, and (b) Rework part (a) if the ground is placed at a instead of o.

Verified Answer:

(a) Using voltage division, \begin{aligned}...

A 1.2-kW toaster takes roughly 4 minutes to heat four slices of bread. Find the cost of operating the toaster once per day for 1 month (30 days). Assume energy costs 9 cents/kWh.

Verified Answer:

Cost = 1.2 KW \times \frac { 4 }{ 60 } hr\...

A 1.8-kW electric heater takes 15 min to boil a quantity of water. If this is done once a day and power costs 10 cents per kWh, what is the cost of its operation for 30 days?

Verified Answer:

W = pt = 1.8x(15/60) x30 kWh = 13.5kWh C = 10cents...

A 12-V battery requires a total charge of 40 ampere-hours during recharging. How many joules are supplied to the battery?

Verified Answer:

W = pt = vit = 12x 40x 60x60 = 1.728 MJ

A 20-kΩ/V voltmeter reads 10 V full scale,(a) What series resistance is required to make the meter read 50 V full scale?(b) What power will the series resistor dissipate when the meter reads full scale?

Verified Answer:

20 kΩ/V = sensitivity = \frac { 1 }{ { I }...

A 30-W incandescent lamp is connected to a 120-V source and is left burning continuously in an otherwise dark staircase. Determine: (a) the current through the lamp, (b) the cost of operating the light for one non-leap year if electricity costs 12 cents per kWh.

Verified Answer:

(a) i=\frac { P }{ V } =\frac { 30 }{ 120 ...

A 60-W, incandescent bulb operates at 120 V. How many electrons and coulombs flow through the bulb in one day?

Verified Answer:

p vi \rightarrow i=\frac { P }{ V } =\frac...

A 600-W TV receiver is turned on for 4 hours with nobody watching it. If electricity costs 10 cents/kWh, how much money is wasted?

Verified Answer:

W = pt = 600x4 = 2.4 kWh C = 10cents x2.4 = 24 cen...

A bar of silicon is 4 cm long with a circular cross section. If the resistance of the bar is 240 Ω at room temperature, what is the cross-sectional radius of the bar?

Verified Answer:

For silicon , \rho =6.4\times { 10 }^{ 2 }...

A battery may be rated in ampere-hours (Ah). A lead-acid battery is rated at 160 Ah. (a) What is the maximum current it can supply for 40 h? (b) How many days will it last if it is discharged at 1 mA?

Verified Answer:

(a) i=\frac { 160A.h }{ 40 } =4 A...
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