Electricity
Using Electrical Energy
Energy
Electricity &Magnetism
Challenging Questions
100
what happens to the circuit when the switch is on. What happens to the light ?
A. The circuit is open and the light turns on
B. The circuit is open and the light is turned off
C. The circuit is closed and the light is turned on
D. The circuit is closed and the light is turned off
D. The circuit is closed and the light is turned on
100
What is the difference between a conductor and an insulator?
A conductor moves electrical currents an insulator slows or does not allow current to move
100
Electrical energy can be converted to other forms of energy such as
A. electricity, discharge and motion
B. current, heat, light
C. Light, Heat, Motion
D. Heat, Energy, Thermal Conduction
C. Light, Heat, Motion
100
A motor is something that
A. changes mechanical energy into electrical energy
B. controls the strength of an electrical magnet
C. attracts metal object
D. changes electrical energy to mechanical energy
D. changes electrical energy to mechanical energy
100
Describe one way in which series circuits and parallel circuits are the same and one way in which they are different.
sereis circuits and parallel circuits have more than one load. series circuit electric current flows along a single path. Parallel circuit electric current flows in more than one path .
200
Electricity flows through circuits as
a. a charge.
b. a current.
c. a discharge.
d. lightning.
In a(n) 
circuit, the electric current flows through a single path.
a. closed
b. open
c. parallel
d. series
B. Current
D. Series
200
Why are short circuits dangerous
A. because the circuit is short
B. because it can cause the light bill to become expensive
C. because it can cause a fireD. because it can cause the house lights to become brighter
C. because it can cause a fire
200
Fuses and circuit breakers are
A. boxes in your house
B. safety devices
C. raises the electricity bill too high to afford electricty
D. are made to destroy any incoming voltage
B. safety devices
200
Which of these could not be used to power a generator?
A. wind
B. water
C. steam
D. aluminum
Which is true about direct current?
A. It runs in two directions
B. It runs in one direction
C. It is used to power home electrical outlets.
D. It is no longer used.
D- aluminum
B- It runs in one direction
200
A magnet is surrounded by an area of magnetic potential. What is it called?
A. Magnetic force
B. Magnetic Field
C. Electromagnet
D. Magnetic potential
What is the definition for an electromagnet?
B. Magnetic Field
An electromagnet is a coil of wire wrapped around a metal core, such as iron. Electric current flowing through the coil sets up a magnetic field.
300
Electricity moves quickly through
_________________ and moves slowly through _______________.
conductors and insulators
300
state 5 basic rules of electrical safety.
keep electrical devices away from water
do not plug to many devices into one outlet
pull a plug out by the plug not by the cord
do not use a cord that is cracked or frayed
do not stick anything into an out let
300
Which changes electrical energy into motion
A. a paper airplane
B. a toaster
C. an electric fan
D. a lamp
Electric current leaves a power plant with a strength of about
A. 100volts.
B. 3000volts.
C. 25,000volts.
D.1,000,000volts.
c. an electric fan
c. 25,000 volts
300
A set of angled blades attached to a shaft that provides mechanical energy for a generator is called
A. a gear.
B. a turbine.
C. a motor
D. an electro magnet
B. a turbine
300
Reading the diagram of how electric motor works
What happens to the shaft of the motor when the coil of wires spin?
the motor shaft spins as well and creates a force. which enables the motor to do work such as turning the wheel or a gear.
400
In a(n)________________ electricity can flow through more than one path.
A balloon can stick to a wall because of __________
The flow of electrical charges through a circuitis called _______________
1. Parallele circuit
2. Static Electricity
3. Static Electricity
400
The voltage of an electric current is changed by a(n)______________
A(n)______________ must be replaced if it melts.
1. Transformer
2. Fuse
400
Electric current enters a step up transformer at 240 volts. The current leaving the transformer is 30 times stronger. What is the new voltage?
7,200 volts
400
Which of the following is true about a circuit breaker?
A. A circuit breaker closes a circuit if it melts.
B. Circuit breakers cannot protect against strong electric current.
C. If electric current gets too high, a circuit breaker melts.
D. A circuit breaker can be reset and used again
D. A circuit breaker can be reset and used again
400
Why were the first factories often built along waterfalls or rushing rivers?
A. it was easier to dump the waste along the water
B. it was convenient for the factory workers and ships to dock to receive supplies
C. Rushing water was used to turn large wheels, which in turned powered machines
D. The water was used to supply the factory workers with water when they have overworked more than 10 hours.
C. Rushing water was used to turn large wheels, which in turned powered machines
500
How does a circuit breaker works?
A. It opens the circuit to provide the flow of current when the current is too low
B. It opens the circuit to prevent the flow of current when the current is too high
C. It closes the circuit to provide the flow of current when the current is too high
D. It closes the circuit to prevent the flow of current when the current is too low
B. It opens the circuit to prevent the flow of current when the current is too high
500
What are the 5 path of energy?
1. Electrical energy is produced at a power plant
2. a transformer increases the voltage of the current 3. a transformer lowers the voltage of a current
4. another transformer lowers the voltage so that it is safe for your home
5. Electrical cables carry electric current back to the power plant.
500
What do magnets attract ? 3 specific types of things
Iron, Colbolt, and Nickel, other magnets and steel which contains iron.
500
1. The area of magnetic force around a magnet is called the ___________________.
2. A flow of electric current can be switched of by a
_______________.
3. A magnet’s force is strongest at its
______________________
1. Magnetic field
2. Circuit breaker
3. Poles
500
1. What are some energy sources used to produce electricity?
2. What is the name of the device that changes kinetic energy of rising steam, falling water, or blowing wind into motion of a generators shaft?
steam, falling water, blowing wind
Turbine