Current and Electricity exam with answers
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Current Electricity - ANSWER the controlled flow of electrons through a conductor
The difference between static electricity and current electricity - ANSWER in static electricity the
electrons gather on the surface of an object and move in all directions whereas in current electricity
there is a steady flow of electrons through a conductor
also, in static electricity the electrons flow between two objects for a short period of time whereas in
current electricity electrons are moving for much longer which can be directed and used to power
devices
2 ways to make an electric device operate - ANSWER - a fully charged battery (delivers small amounts of
electrical energy)
- an electric generating station (delivers large amounts of electrical energy)
What does current electricity require? - ANSWER Current electricity requires a source of electrical energy
to create a flow of electrons. (i.e. a battery or an electric generating station)
Electric Circuit - ANSWER a continuous path in which electrons can flow
Describe the path of electrons for an MP3 player - ANSWER Electrons flow from the battery through
conducting wires and return to the battery. The flow continues as long as the MP3 player is on and until
the battery is dead. The continuous path for the electron flow is the circuit.
What does a simple electric circuit include? - ANSWER (1) an energy source
(2) a load
(3) conducting wires
, (4) sometimes a switch
Load and Examples - ANSWER the part of an electric circuit that converts electrical energy into other
forms of energy (ex. heaters, lamps, microchips light bulb)
What is an example of a load that converts electrical energy into light and thermal energy? - ANSWER a
light bulb
Conducting Wires/Connecting Wires - ANSWER the parts of the electric circuit that provide a path way
for electrons to flow from one component of the circuit to another which are usually constructed from
insulated copper or aluminum wires
Switch - ANSWER a device in an electric circuit which controls the flow of electrons by opening or closing
the circuit
What happens when you turn the switch off? - ANSWER The circuit is open and the path is incomplete
hence there is no electric current flow
What happens when you turn the switch on? - ANSWER The circuit is closed and the path is complete
hence the electric current that flows through it
Explain the different parts of a flashlight - ANSWER - the batteries are the energy source
- the bulb is the load
- the switch controls the flow of electrons
- the connecting wires provide a closed path that joins all the parts of the circuit together
Electrical Energy - ANSWER the energy provided by the flow of electrons in an electric circuit
What is the unit for electrical energy? - ANSWER Joules
;; verified by experts
Current Electricity - ANSWER the controlled flow of electrons through a conductor
The difference between static electricity and current electricity - ANSWER in static electricity the
electrons gather on the surface of an object and move in all directions whereas in current electricity
there is a steady flow of electrons through a conductor
also, in static electricity the electrons flow between two objects for a short period of time whereas in
current electricity electrons are moving for much longer which can be directed and used to power
devices
2 ways to make an electric device operate - ANSWER - a fully charged battery (delivers small amounts of
electrical energy)
- an electric generating station (delivers large amounts of electrical energy)
What does current electricity require? - ANSWER Current electricity requires a source of electrical energy
to create a flow of electrons. (i.e. a battery or an electric generating station)
Electric Circuit - ANSWER a continuous path in which electrons can flow
Describe the path of electrons for an MP3 player - ANSWER Electrons flow from the battery through
conducting wires and return to the battery. The flow continues as long as the MP3 player is on and until
the battery is dead. The continuous path for the electron flow is the circuit.
What does a simple electric circuit include? - ANSWER (1) an energy source
(2) a load
(3) conducting wires
, (4) sometimes a switch
Load and Examples - ANSWER the part of an electric circuit that converts electrical energy into other
forms of energy (ex. heaters, lamps, microchips light bulb)
What is an example of a load that converts electrical energy into light and thermal energy? - ANSWER a
light bulb
Conducting Wires/Connecting Wires - ANSWER the parts of the electric circuit that provide a path way
for electrons to flow from one component of the circuit to another which are usually constructed from
insulated copper or aluminum wires
Switch - ANSWER a device in an electric circuit which controls the flow of electrons by opening or closing
the circuit
What happens when you turn the switch off? - ANSWER The circuit is open and the path is incomplete
hence there is no electric current flow
What happens when you turn the switch on? - ANSWER The circuit is closed and the path is complete
hence the electric current that flows through it
Explain the different parts of a flashlight - ANSWER - the batteries are the energy source
- the bulb is the load
- the switch controls the flow of electrons
- the connecting wires provide a closed path that joins all the parts of the circuit together
Electrical Energy - ANSWER the energy provided by the flow of electrons in an electric circuit
What is the unit for electrical energy? - ANSWER Joules
