Electronic Circuits Fundamentals and Applications 5th. Edition by Mike Tooley | 9780367421984 | 367421984

Electronic Devices and Circuits

Electronic Circuits Fundamentals and Applications

169 SOLVED PROBLEMS

3 SOLVED PROBLEMS

Question: 5.57

A 150 μF capacitor is charged to a potential of 150 V. The capacitor is then removed from the charging source and connected to a 2 MΩ resistor. Determine the capacitor voltage 1 minute later. ...

Verified Answer:

We will solve this problem using the tabular metho...

Question: 5.40

A current of 1.5 A is drawn from a 3 V battery. What power is supplied? ...

Verified Answer:

Here we must use P = I ×V where I = 1.5 A and V = ...

Question: 1.20

A voltage drop of 4 V appears across a resistor of 100 Ω. What power is dissipated in the resistor? ...

Verified Answer:

Here we use

P = V ^2 / R (\text { where } ...

Question: 1.9

A current of 7.25 mA flows in a circuit. Express this current in amperes using exponent notation. ...

Verified Answer:

1 \ mA=1\times 10^{-3} \ A \text { thus }7...

Question: A8.18

A capacitor is charged to a potential of 100 V. It is then disconnected from its charging source and left to discharge through a resistor. If it takes 10 s for the voltage to fall to 50 V, how long will it take to fall to 10 V? ...

Verified Answer:

Here we are dealing with exponential decay. If we ...

Question: A8.17

An amplifier has a power gain of 33 dB. What input power will be required to produce an output power of 11 W? ...

Verified Answer:

Now power gain expressed in decibels will be given...

Question: A8.16

An amplifier has a power gain of 27,000. Express this in Bels (B) and decibels (dB). ...

Verified Answer:

In Bels, power gain =

\log _{10}

(27,...

Question: A8.15

Part of the control logic for an intruder alarm is shown in Fig. A8.31. Determine the logic required to select the Y4 output and verify that the Y3 output is permanently selected and unaffected by the states of S1 and S2. ...

Verified Answer:

Each logic gate shown in Fig. A8.31 is a two-input...

Question: A8.14

The voltage appearing at the secondary winding of a transformer is shown in Fig. A8.19. Determine: (a) the period of the voltage (b) the value of the voltage when (i) t = 5 ms and (ii) t = 35 ms (c) the maximum and minimum values of voltage (d) the average value of the voltage during the time interval 0 to 40 ms (e) the equation for the voltage. ...

Verified Answer:

All of the above can be obtained from the graph of...

Question: A8.13

The voltage applied to a high voltage rectifier is given by the equation: ν = 800 sin(314 t) Determine the voltage when: (a) t = 1 ms (b) t = 15 ms. ...

Verified Answer:

We can easily solve this problem by substituting v...

Question: 1.14

A 12 Ω resistor is connected to a 6 V battery. What current will flow in the resistor? ...

Verified Answer:

Here we must use

I=V/R

(where [late...

Question: 1.26

A coil of 800 turns is wound on a closed mild steel core having a length 600 mm and cross-sectional area 500 mm². Determine the current required to establish a flux of 0.8 mWb in the core. ...

Verified Answer:

Now B = Φ /A = (0.8 × 10

^{-3}

) / (5...

Question: 1.17

A coil consists of an 8 m length of annealed copper wire having a cross-sectional area of 1 mm². Determine the resistance of the coil. ...

Verified Answer:

We will use the formula, R = ρl / A. The value of ...