Current
V= I * R. What size resistor would produce a 3 Amp current flow with a 12 Volt battery
4 Ohms
What is a series circuit
A circuit where electricity flows in one loop only
The unit of electric current...
ampere (amp)
The area around a magnet where magnetic forces can be felt.
A magnetic field
Electric charges can be either...
positive and negative
What type of current comes from wall outlets?
AC, or alternating current
This type of circuit allows electricity to take multiple paths
A parallel circuit
You make a simple circuit by connecting a single battery to a wire. It catches on fire. If the battery had a voltage of 1.5v and a resistance of 0.6Ω, how much current was going through the battery?
2.5 amps
These two poles of a magnet always attract each other.
North and South poles
What is the reason birds don’t get electrocuted when sitting on power lines
They don’t complete a circuit
What is current?
the movement of charges such as electrons, usually through a circuit
The part of a circuit that provides energy to the electrons
A power source or battery
The unit used to measure resistance
Ohm (Ω)
A material that can be magnetised and is attracted to magnets.
Iron
The reason compasses point north?
Earth has a magnetic field with a magnetic north pole
What is the difference between conductors and insulators?
conductors allow flow, insulators block flow
A circuit with a 9V battery is made out of 3 loops with 3 switches per loop in a parallel. Each circuit contains a bulb.
How many volts reach each bulb?
9V
The equation that links voltage, current, and resistance.
V = I × R.
The name for a magnet created by electricity.
An electromagnet.
The invisible force that makes magnets attract or repel
Magnetic force
A circuit contains three identical bulbs connected in parallel to a 9V battery. Each bulb has a resistance of 4.5 ohms.
Calculate the total current flowing from the battery.
Total current = 2A × 3 bulbs = 6 amperes.
In a series circuit, this happens to the current when more resistors are added.
The current decreases.
A 9V battery powers a circuit made up of 3 loops connected in parallel. Each loop contains 3 closed switches and one identical bulb.
Assume each bulb has a resistance of 4.5 ohms.
How much current flows through each bulb?
I=9V/4.5Ω=2A
his happens when you cut a bar magnet in half.
You get two smaller magnets, each with a north and south pole.
This everyday device uses both electricity and magnetism to convert electrical energy into motion, and is found in toys, fans, and even electric cars.
An electric motor.