Order DC Voltages and Circuits Discussion

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