Electric Circuits

Question 1

Electric circuits

Answer 1

-A closed path along electrons that are powered by an energy source (e.g. cell or battery)can flow

-electrons return to the energy source

Question 2

Terminal

Answer 2

-location on a cell that must be connected to other components to from a circuit
-positive and negative terminals

Question 3

Fuel cells

Answer 3

Fuel cell car and trucks combine hydrogen and oxygen to produce electricity,which runs a motor.
Converting hydrogen gas into electricity produced only water and heat as a byproduct,meaning fuel cell vehicles don’t create tailpipe pollution when they’re driven

Question 4

Wire

Answer 4

-e.g (metal aluminum,copper) wire coated with plastic or rubber insulator

Question 5

Switch

Answer 5

-switches are control devices (conducters) that complete or break the circuit to white it is connected.
-a switch is not required for a circuit to operate
-connecting wires (conductors) join together the circuit components. E.g. switch,bulb,battery.

Question 6

Solor cells

Answer 6

-solar cells are cells that convert sunlight into electrical energy.
When sunlight strikes a semiconductor such as silicon in a solar cell,electrons are knocked loose from the atoms
-solar cells can be used to power anything from calculators and ornamental lights to homes,satellites, and even communities.

Question 7

Movement of electrons not in a circuit

Answer 7

If a conductor wire is not part of an electric circuit,electrons move in random directions,colliding with electrons or other ions.
-the electrons move quickly but will not flow in one direction along the wire.

Question 8

Movement of electrons in a circuit

Answer 8

-chemical reaction in cell cause charges to separate (excess of electrons at -ve electrode;deficit at +ve electrode)
-charge separation produces electric field which moves through circuit at speed of light

-electric field in competed circuit causes electrons to move in one direction (-ve to. +ve end) through wire

Question 9

Electric current

Answer 9

-the electric field produced when a
Cell is connected to a circuit forces the free electrons to move in one direction through the conducting wire.
-this produces an electric current.
-the rate (time) of movement of electric charge
-due to flow of electrons
-measured with an ammeter
-unit is amps,A

-flow of electrons along a specific path
-comes from generators,batteries (cells)
—e.g. in electrical appliances

Question 10

electrical resistance

Answer 10

-property of a substance that hinder electric current and converts electrons energy into other forms of energy.

Question 11

Electric resistance

Answer 11

-property of substance that hinders electric current and converts electrical energy into other forms of energy.