Download Chapter 1, Solution 1

TUTORIAL 1
1. Chapter 1, Problem 4 (Trigonometric function)
The current flowing through a device is
it   5 sin 6 tA . Calculate the total charge flow through the device from t = 0 to t = 10 ms.
2. Chapter 1, Problem 5 (Exponential function)
Determine the total charge flowing into an element for 0 < t < 2 s when the current entering its
positive terminal is i t   e 2t mA .
3. Chapter 1, Problem 8 (Graph functions)
The current flowing past a point in a device is shown in Fig. 1.25. Calculate the total charge
through the point.
Figure 1.25
4. Chapter 1, Problem 11 (Constant current and voltage)
A rechargeable flashlight battery is capable of delivering 85 mA for about 12 h. How much
charge can it release at that rate? If its terminals voltage is 1.2 V, how much energy can the
battery deliver?
5. Chapter 1, Problem 16 (Graph functions)
Figure 1.27 shows the current through and the voltage across a device. Find the total energy
absorbed by the device for the period 0 < t < 4 s.
Figure 1.27
6. Chapter 1, Problem 18 (PSC)
Find the power of each of the element in Fig. 1.29. State whether the element is delivering or
absorbing power.
Figure 1.29
7. Chapter 1, Problem 20 (Power Conservation)
Find V0 in the circuit of Fig. 1.31.
Figure 1.31
8. Chapter 1, Problem 26 (Constant current and voltage)
A flashlight battery has a rating of 0.8 ampere-hours (Ah) and a lifetime of 10 hours.
(a) How much current can it deliver?
(b) How much power can it give if its terminal voltage is 6 V?
(c) How much energy is stored in the battery in kWh?
9. Chapter 1, Problem 29 (Electricity Billings)
An electric stove with four burners and an oven is used in preparing a meal as follows.
Burner 1: 20 minutes
Burner 2: 40 minutes
Burner 3: 15 minutes
Burner 4: 45 minutes
Oven: 30 minutes
If each burner is rated at 1.2 kW and the oven at 1.8 kW, and electricity costs 12 cents per kWh,
calculate the cost of electricity used in preparing the meal.
10. Chapter 1, Problem 30 (Electricity Billings)
GPU Energy (the electric power company in New Jersey) charged a consumer $52.75 one
month. If the basic service charge is $5.23 and the company charges $0.11 per kWh, how much
energy in kWh was used by the consumer?