Order DC Voltages and Circuits Discussion

Order DC Voltages and Circuits Discussion

2.1 A voltage of 0.0025 V expressed in microvolts is

• a 25 μν

• b 250 μν

• c 2.5 μν

• d 2500 μν

2.2 A voltage of 800 m V expressed in volts is

• a 0.008 V

• b 0.08 V

• c 0.8 V

• d 8.0 V

2.3 A voltage of 0.36 m V expressed in microvolts is

• a 360 μν

• b 36 μν

• c 3.6 μν

• d 3600 μν

2.4 A voltage of 800 Χ 10

3

μ expressed in

millivolts is

• a 80 mV

• b 800 mV

• c 8.0 m V

• d 8000 mV

2.5 A voltage of 0.25 kV expressed in volts is

• a 2.5 V

• b 25 V

• c 250 V

• d 2500 V

2.6 If 2.4 J are required to mov e 15 C from

point A to point Β in a circuit, the potential

difference between the two points is

• a 0.12 V

• b 0.16 V

• c 6.25 V

• d 6.75 V

Order DC Voltages and Circuits Discussion

2.7 A current of 0.5 A is measured at a circuit

point over a period of 2 min. The charge

that has passed that point is

• a 10 C

• b 20 C

• c 4 0 C

• d 6 0 C

2.8 If the current at a circuit point is 0.25 A, the

time for 7.5 C to flow is

• a 30 s

• b 35 s

• c 3.5 s

• d 2.5 s

2.9 If the parameters in Question 2.8 are 100

m A and 0.5 C, the time is

• a 0.5 s

• b 5.0 s

• c 5 0 s

• d 500 s

2.10 If there is a flow of 360 C in a resistor over

a period of 30 min, the current is

• a 200 mA

• b 360 mA

• c 2 A

• d 20 A

DC voltages and circuits 9

2.11 If the parameters for Question 2.10 are 60

m C and 2 hours, the current is

• a 4.33 μ Α

• ft 6.67 μ Α

• c 7.33 μ Α

• d 8.33 μ Α

2.12 A current of 20 m A expressed in amps is

• a 0.002 A

• b 0.02 A

• c 0.2 A

• d 2.0 A

2.17 The input powe r in Question 2.16 is

• a 240 W

• b 30 W

• c 120 W

• d 2 W

2.18 If the resistor in Question 2.16 is changed to

24R, the input current is then

• a 20 μ Α

• b 200 μ Α

• c 2 0 m A

• d 5 A

2.13 A current of 60 μ A expressed in milliamps

is

• a 600 m A

• Hm A

• c 0.6 mA

• d 0.06 mA

2.14 A powe r of 0.05 M W expressed in kilowatts

is

• a 0.5 k W

• b 5 k W

• c 50 k W

• d 500 k W

2.15 A powe r of 12 m W is equivalent to

• a 12 Χ 10″

3

W

• ft 12 X 10~

6

W

• c 12 Χ 10

3

W

• d 12 Χ 10

6

W

2.16 The diagram shows a single resistor connected to a D C supply. Th e current / is

• a 2 A

• b 0.2 A

• c 0.5 A

• d 2 m A

2.19 Th e input powe r in Question 2.18 is

• a 12 W

• ft 20 W

• c 22 W

• d 600 W

2.20 The diagram shows two resistors connected

in parallel and driven by a D C supply. The

current / is

• a 0.2 A

• ft 2.4 A

• c 3.6 A

• d 4.0 A

RL

^ZZD— :

R 2 ~~ |

L >H==D — I

/ χ

8 R

I V=2 4 I

I 60R ‘ 1

1 \/ = 120 J

2.21 In Question 2.20 the value of current Ix

is

• a 10 mA

• ft 100 m A

• c 1.0 A

• d 2.0 A

2.22 In Question 2.20 the value of current I2

is

• a 2.0 A

• ft 3.0 A

• c 200 m A

• d 300 m A

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