⚡ Very Important Vocab
A closed path that electricity flows through.
Circuit
Two North magnets will do this.
Repel
Materials that allow electrons to freely flow are called…
Conductors
If a 20 amp current has a resistance of 30 ohms, what is the voltage difference?
V=IR
V=(20amp)(30ohms)
V=600 V
Which circuit has two or more paths for electricity to travel through?
Parallel
Negative particles in an atom that are used to produce electricity
Electrons
Where the magnetic field is strongest in a magnet.
At the poles.
Tendency of an object to oppose the flow of electrons
Resistance
If a 180 V battery has 9 amps of current flowing through it, what is the resistance?
R=V/I
R=180/9
R=20 ohms
A circuit that does not make a complete path would be …
Open
Accumulation of excess electric charge.
Static Electricity
Temporary magnet made by placing a piece of metal, like iron, in a current-carrying coil of wire.
Electromagnet
Net movement of electrons in a single direction
Current
Draw a series circuit with 1 battery, a closed switch, an ammeter, a resistor, and a light bulb.
INSERT PICTURE HERE
Magnetic elements have magnetic domains within their atoms that are …
Aligned
Device that detects electrical charge.
Electroscope
Two ways to increase the strength of an electromagnet.
Increase the number of coils/loops
Increase the strength of the current
The way electrons move
Like a bunch of bouncy balls thrown down stairs (aka, crazily)
Draw a parallel circuit with 2 batteries, 2 light bulbs on separate branches, and an open switch to turn one of the light bulbs off.
INSERT DRAWING HERE
Explain how a battery works.
Chemical reaction creates a voltage difference between terminals that causes current to flow out the (-) end and into the (+) end
The push that causes charges to move.
Voltage difference
What energy conversion occurs inside a generator?
Mechanical energy 🡪 electrical energy
(using an electromagnet)
Describe two ways to prevent a circuit from overheating.
Fuse = piece of metal that melts to open circuit and prevent current from flowing
Circuit breaker = piece of metal that bends to open circuit and prevent current from flowing.
Draw a circuit with 2 batteries, 3 light bulbs connected in parallel, 1 light bulb connected in series to the other three, and an open switch that could turn all of the light bulbs off.
INSERT DRAWING HERE :)
How does lightning work?
Moving clouds create a build up of static electricity. Charge becomes so great it induces a positive charge on ground. Attraction eventually becomes so strong e- travel to earth (in the bolt) to neutralize.