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WorksheetsDC ELECTRIC CIRCUITS PROBLEMS
Total questions: 37
Worksheet time: 19mins
What do you expect when you use the two 20 kohms, 1 watt resistor in parallel instead of one 10 kohms, 1 watt?
Provide lighter current
Provide wider tolerance
Provide more power
Provide less power
The total resistance of a two similar wire conductors connected in parallel is
same resistance of one wire
double the resistance of one wire
one half the resistance of one wire
resistance of one wire multiplied by 4
When you increase the resistance in a circuit, the flow of electrons will
be constant
flow faster
be stopped
be decreased
Which of the following allows more current if applied to the same voltage?
0.002 siemen
25 ohms
0.004 siemen
2.5 ohms
Ohm’s law refers to _____.
power is directly proportional to both voltage squared and the resistance
power is directly proportional to the resistance and inversely as the current squared
current varies directly as the voltage and inversely as the resistance
current is directly proportional to both voltage
A circuit which a break exists in the complete conduction pathway
Open circuit
Short circuit
Close circuit
Circuit
How much is the equivalent power in watts can a 3 horse power provide?
3000 watts
248.66 watts
1492 watts
2238 watt
The current needed to operate a soldering iron which has a rating of 600 watts at 110 volts
18,200 A
0.182 A
66,000 A
5.455 A
Find the power across the resistor of 5 ohms delivered from a battery of an internal resistance of 3 ohms and a constant emf of 4 volts.
120 watts
100 watts
60 watts
1.25 watts
A series circuit in which desired portions of the source voltage may be tapped off for use equipment.
Voltage trap
Voltage selector
Voltage divider
Dividing network
An electronic device draws 300 watts from its 24 volt power source. Find effective resistance.
1.25 Ω
1.92 Ω
19.20 Ω
12.50 Ω
How much power does an electronic equipment consume, assuming a 5.50 amperes current flowing and a 120 volts power source?
125.5 watts
66 watts
660 watts
60 watts
What type of circuit whose parameters are constant which do not change with voltage or current?
Tuned circuit
Reactive circuit
Linear circuit
Lumped circuit
If three circuits, each with a value of 560 ohms are connected in parallel, what is the total resistance of the combination?
1680 ohms
560 ohms
18567 ohms
187 0hms
Other factors remaining constant, what would be the effect on the current flow in a given circuit if the applied potential were doubled?
It would double
It would increase 4 times
It would remain the same
It would be decrease by ½
Find used power of a circuit whose power source supplies 20 volts and a load resistance of 200 ohms.
1 watt
4 kilowatts
10 watts
2 watts
When resistors are connected in series, what happens?
Nothing
The tolerance is decreased
The effective resistance is decreased
The effective resistance is increased
A condition in which the heat in of around the circuit increases beyond or to a higher than normal level.
Excessive heat condition
Open condition
Direct short
Grounded
If 3,300 ohms resistor and a 22,000 ohms resistor are connected in series, what is the total resistance?
18,700 ohms
25,300 ohms
5,500 ohms
2,870 ohms
A device that draws current
Source
No load
Load
Shunt
With the same voltage applied which of the following allows more current?
25 ohms
250 ohms
2.5 ohms
0.25 ohms
If 12 V are applied to a circuit that consumes 78 W, what is the current flow through the circuits?
6.5 A
936 A
0.15 A
9.36 A
Ohm’s law is not applicable to
copper
silicon carbide
silver
aluminum
The practical unit of electrical energy is
watt
kilowatt-hour
kilowatt
megawatt
4.A 100 watt lamp working for 20 hours will consume ____ units.
. 200
20
2
5
The hot resistance of an incandescent lamp is about ____ its cold resistance.
10 times
2 times
100 times
50 times
A d.c. circuit usually has ____ as the load.
resistance
. inductance
capacitance
both inductance and capacitance
The purpose of load in an electric circuit is to
increase the circuit current
utilize electrical energy
decrease the circuit current
none of the above
Electrical appliances are not connected in series because
series circuit is complicated
appliances have different current rating
power loss is more
none of the above
Electrical appliances are connected in parallel because it
is a simple circuit
draws less current
results in reduce in power loss
makes the operation of appliances independent of each other
Inductance and capacitance are not relevant in a d.c. circuit because
frequency of d.c. is zero
it is a simple circuit
they do not exist in a d.c. circuit
none of the above
Which of the following statement is TRUE both for a series and parallel d.c circuit?
powers are additive
voltages are additive
current additive
elements have individual currents
What do you call a resistor that does not obey Ohm’s Law?
Potentiometer
Carbon-Film Resistor
Wire-Wound Type
Non-linear Resistor
A simple electronic equipment which takes a 2 amperes current from a power source has a total load resistance of 100 ohms. How much power does it use?
200 watts
100 watts
400 watts
50 watts
Which of the following is not a valid expression of ohm’s law?
E = IR
R = PI
R = E/I
I = E/R
Refers to the most important components in controlling flow of electrons
voltage, electromotive force and current
reactance, current and resistance
conductance, resistance and reactance
voltage, resistance and current
The theory of Ohm’s law is applied in a _____ circuit
linear
exponential
trivalent
unilateral
