Current Electricity Flashcards
What is the current electricity?
It is the continuous flow charge
What does you call a group of electrons?
Coloumb
What do electrical currents do?
Transfer energy thats why a light bulb can glow
What is required for a current to flow
- a source of electrical energy
- closed circuit
- conductors in a circuit
What components must be attached to each other?
- from the one terminal of cell / battery
- along wires or conductors
- through the filament of incandescent bulbs or other components
- back to the other terminal of the cell / better
What is the minimum components in a circuit?
- a source of energy
- conductors
- something to give an indication that the current is flowing
What are connecting wires
- made from metals that are good conductors
- transfer electrical charges over short or long distances
What is a battery?
is a combination of more that on cell connector in series
How do a battery work?
cells have chemical energy
the chemical energy only reacts when a circuit is completed
it is converted into electrical energy
the electrical energy charges is delivered to the circuit
What does the cell create?
a potential difference (tension) by supplying electrical kinetic energy to electrical energy charges
What is a switch
used to open and close circuit
Name reasons why a circuit can be incomplete
- open switch
- a loose contact of the switch
- a broken wire
- a broken filament in the bulb
What is a resistor
is a circuit component that offer resistance against the flow of charge
What does a resistor have a effect on?
magnitude of the electrical current
The higher the resistance?
the weaker the current
How does a old fashioned light bulb work?
- There’s a resistor wire connected to 2 contact points
- One part connected to screw part
- other part connected to a knob at the bottom
- Filament heats up until it is white hot
- electrical energy converted to heat energy
What are the effects of an electrical current?
- heating effect
- magnetic effect
- chemical effect
What does the electrical current transfer?
Particles in the conductor
What does a filament of a bulb have?
- high resistance
- does not melt easily
What is a short circuit?
When the electrical current takes the path of lowest resistance
What are fuses?
Spesial wires that melt if the circuit overheat
Why is a current broken?
The fuse melt
What is the magnetic effect?
A current -carrying conductor causes a magnetic field around the conductor
What happen when there is no current?
The compass needle return to the north - south direction
What happen when a current flous through a conductor
It effect the needle of a compass close to it
How do you change an electromagnet into a stronger magnet?
- connect more cells in series in the circuit
- place a nail in the coil
- use a steel nail instead of a iron nail
What is the decomposition of a chemical compound by means of electrical current called?
Electrolysis
What is the solution in which electricity is conducted in?
Electrolyte
What is the anode?
The electrode connected to the positive terminal of the battery
What is the cathode?
The electrode connected to the negative terminal of the battery
What can electrolysis be used for?
- break-up water into hydrogen and oxygen
- break-up copper chloride solution into copper metal at the cathode and chlorine gas at the anode
