Font size
WorksheetsCircuits
Total questions: 83
Worksheet time: 1hrs 16mins
Which lights would turn on if your closed switches 1 and 2?
red, blue, and white
red and white
red and blue
blue, white, yellow
An oscilloscope shows the current flow above what type of current is it showing?
DC
AC
Rectified Current
Non rectified current
DC
AC
rectified current
non rectified current
DC stands for __________ current.
deviating
default
diverging
direct
AC stands for __________ current.
alternating
Adjusting
Alarmed
Additional
What type of current is flowing in the circuit ?
Alternating current
Direct current
Both
None
This is an example of a ______ circuit
Series
Parallel
Open
Dihexihedral
Quantity of charge can be measured in
time (s)
Ampere (A)
coulombs (C)
Joule (J)
What was Edison's proposed system of electricity called?
Alternating Current
Direct Current
AC Current
Safe Current
What was Tesla's proposed system of electricity called?
Alternating Current
Direct Current
DC Current
Safe Current
Which system of electricity was generally considered more dangerous?
AC
DC
If a transformer increases voltage, it is called a ......... transformer.
step right
step left
step up
step down
Which of the following is an example of appliance using alternating power source?
Why transformers work with A.C. current but not D.C.
A.C current produces changing magnetic field.
D.C current produces changing magnetic field.
D.C current is weak
A.C current is powerful
A transformer has 100 turns in the primary coil and 25 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil?
480V
30V
20V
450V
In order for electromagnetic induction to occur, there must be relative............between a magnetic field and a conductor.
race
Motion
field
voltage
The primary function of a fuse is to
Open the circuit
Protect the appliance
Protect the line
Prevent excessive currents from flow through the circuit
To prevent overload and overheating of wires
fuses are used
circuit breakers are used
fuses and circuit breakers are used
fuses and resistor are used
A connection that allows current to take the path of least resistance is a
short circuit
long circuit
parallel circuit
series circuit
A current is electrically ______ when charges are able to flow directly into Earth.
voltage source
power
series
grounded
static electricity
Which of the following describes a motor?
It creates mechanical energy.
It doesn't need an electrical source to function.
It doesn't follow the Law of Conservation of Energy.
It converts electrical energy into mechanical energy.
Which of the following converts electrical energy into mechanical energy ?
circuit breaker
generator
transformer
washing machine
Motors create mechanical energy.
True
False
Which are the characterictics of a CFL light bulb?
These should be thrown in the regular trash.
These light bulbs use 85% less energy than an incandescent bulb.
Contain Mercury gas
Contain a filament made of tungsten.
Last 20X longer than an incandescent bulb.
Which are the characterictics of a LED light bulb?
Are the most energy efficient of all bulbs.
These light bulbs use 85% less energy than an incandescent bulb.
Contain Mercury gas
Contains many diodes in a single bulb.
Have the longest life of all bulbs
Problems with the CFL (compact fluorescent lights) include
made with a toxic substance - mercury
tmade with a toxic substance - tungsten
produce a unpleasant light - wavelength that is different from the incandescent bulb.
are the most expensive bulb
Which bulb generates the most heat?
Which bulb is made with a semi-conductor that moves electrons to produce light?
Which bulb is the most energy efficient and most expensive?
Which bulb is the most inexpensive?
The East Grand Rapids School District replaced all of the lights about 3 years ago in all of the buildings. They switched from __________ to _____________ to save energy and money.
incandescent to CFL
CFL to LED
incandescent to LED
LED to CFL
Which characterictics would describe an incandenscent light bulb?
very energy efficient
made with mercury
contains a filament
most of the energy is transferred to heat
A transformer is a device that changes the voltage of
a direct current
an alternating current
Transformer is always connected to ___________ supply.
A.C.
D.C.
Transformer transforms _________ from primary to secondary.
Only Current
Only Voltage
Both Voltage and Current
Electrical symbol of a TRANSFORMER
What is the type of transformer?
Step-up transformer
Step-down transformer
What is meant by "output voltage"?
The voltage that had been changed by the transformer.
The voltage supplied by the source.
The following are some examples of machines that use
step-down transformers.
mobile phone charger
microwave oven
X-ray machine
Diagram below shows a system for the transmission of electricity.
Which arrangement of transformers is correct?
All receptacles installed in bathrooms and garages must have GFCI protection.
TRUE
FALSE
Most electrical appliances are rated in what units?
OHMS
VOLTS
AMPS
WATTS
The major disadvantage, with solar cells for power generation is
lack of availability
large area requirement
variable power
high cost
Present day solar cells are made of
germanium
silver
silicon
aluminium
The principle of solar photovoltaics is
Electron-hole recombination
Electron-hole pair production
Absorption and emission of light
Jumping of electron from lower energy level to higher energy level
What does a photovoltaic panel produce?
Heat
Thermal energy
Electricity
Mechanical energy
How do solar cells use produce electricity?
Converting heat
Thanks to the movement of electrons inside the cells
Using thermal energy
Transforming photons into electrons
What does photons bring electrons
energy
light
waves
The wafer in a cell has to be
conducting
semi-conducting
not conducting
It is a good idea to not plug too many things into one outlet, since there is a risk of overloading the circuit at that outlet.
true
false
It is generally okay to use electrical devices around water if you use a good quality extension cord.
true
false
An electrical ground provides a alternative path for current if something goes wrong in a circuit or device.
true
false
Select all the true statements about electrical ground.
The earth is a terrific electrical ground because it has very low electrical potential.
Your home can be grounded to a cold water pipe or a rod driven into the ground outside.
The round hole on a three prong wall plug is the electrical ground.
The sky is the best electrical ground because it is so immense.
The following are advantages of a series circuit EXCEPT:
Series circuits do not overheat easily.
Easy to install and easy to repair and maintain
All loads in a series circuit have the same current.
If one load fails, all loads in the circuit will not function.
The following are disadvantages of a series circuit EXCEPT:
It is difficult to control the load individually.
It is easy to install, repair and maintain the circuit.
It is difficult to identify the damaged light bulb in the circuit.
Since voltage is not equal for every load, not all loads will have the same brightness.
The following are advantages of a parallel circuit EXCEPT:
Loads are easy to control.
If one load fails, other loads can still function.
Large volume of conducting wires will be needed.
Every load connected in parallel circuit gets an equal amount of voltage.
The circuit does not overheat easily. It is a/an...
advantage of series circuit.
advantage of parallel circuit.
disadvantage of series circuit.
disadvantage of parallel circuit.
It is easy to control the load individually. It is a/an...
advantage of series circuit.
advantage of parallel circuit.
disadvantage of series circuit.
disadvantage of parallel circuit.
Adding more loads may cause overloading in the circuit. It is a/an...
advantage of series circuit.
advantage of parallel circuit.
disadvantage of series circuit.
disadvantage of parallel circuit.
In which configuration is the current supplied by the battery the greatest?
X
Y
Z
X, Y, and Z are the same.
