What is transferred from one object to another to cause "static"?
What are electrons
100
List the 3 things that effect the resistance in a circuit and how it is affected.
What is length of wire: longer increases R./ temperature: hotter increases R./ thickness of wire: thinner increases R.
100
Explain the purpose of fuses and circuit breakers
What is to prevent too much current flowing through the circuit which a=can cause overheating and fires
100
List the 3 elements that can be made into permanent magnets.
What are iron, nickel, cobalt
100
How are motors and generators the same and how are they different.
What is motors and generators both have a permanent magnet and an electromagnet. Motors change electrical energy to mechanical energy while generators do the opposite.
200
When I rubbed the balloon on my head, that was "charging by____"
What is contact
200
State Ohm's Law, including units
What is Current in amps is equal to voltage difference in volts divided by resistance in ohms.
200
How much power does a toaster use drawing a current of 10 amps, plugged into a standard household outlet?
What is 1200 watts
200
Explain magnetic domains
What are small groups of atoms that, together, act like small magnets, complete with N and S poles.
200
How can you increase the spin rate of a motor?
What is increase the amount of current
300
When I stuck the balloon to the white board, that was "charging by_____"
What is induction.
300
Calculate the resistance in a light bulb with 0.5 amps of current and 120 v.
What is 240 ohms
300
A hairdryer uses 1.5 kW of power when plugged into the wall. What is the current in the hairdryer?
What is amps
300
Explain what Hans Christian Oerstead discovered.
What is the fact that current moving through a wire causes a magnetic field around the wire.
300
Explain alternating current and direct current. By what are each created?
What is alternating current in created by generators and the electrons zig-zag back and forth as they move along. Direct current is created by batteries and the electrons move in one direction.
400
The force that pushes electrons through a circuit.
What is voltage difference.
400
State what is true of the current and voltage in a series circuit
What is current remains the constant and voltage decrease through the circuit
400
The electric meter reading at the beginning of one month is 6543 kWh and 7654 at the end of the next. How much energy has been used?
What is 1111 kWh
400
To make an electromagnet, what three components do you need?
What a solenoid(wire coil), an iron core, and a source of voltage to create current.
400
What is a transformer(include what step up and step down transformers are) and why are they used.
What is step up transformers increase voltage to be sent over long distances so that energy isn't lost as heat. Step down transformers decrease voltage so that too high a voltage isn't brought into a building or device.
500
the directions electrons flow in a circuit
What is from high energy to low energy or from negative terminal to positive terminal
500
State what happens to the current and voltage in a parallel circuit
What is the voltage remains constant and the current is higher in branches with less resistance.
500
An electric light is plugged into the wall and has a current of amp. how much energy does the light use in 15 minutes?
What is 0.03 kWh
500
Explain what Faraday discovered.
What is the fact that a magnetic field moving through a wire coil creates an electric current in the wire. This is called electromagnetic induction.
500
Calculate the output voltage of a transformer with 2500 coils on the secondary side and 25 coils on the primary side if the input voltage is 500 volts