What is a disadvantage of connecting bulbs in series?
If one light bulb or battery dies, the circuit is open, and the lights get dimmer if you add more batteries.
100
What is a switch used for?
A switch is used to start and stop the flow of an electric current in a circuit.
100
What is an electromagnet?
A temporary magnet made when electric current flows through a wire wrapped around an iron core.
100
What is a circuit?
The path that an electric current follows
100
Imagine you had two batteries wired in series and one bulb. How much electric current is flowing through the one bulb?
Two batteries in series + one bulb = 3.0 Volts of Power in one bulb
200
What is a disadvantage of connecting batteries in series?
If one battery dies the circuit is open.
200
Where does the electric current leave the battery?
The negative end of the battery has extra electrons. They follow the path that leads them to the positive end of the battery which is missing electrons.
200
What are three items needed to create an electromagnet?
Iron core, a coil of wire, a source of electricity.
200
What is an electric current?
The flow of electricity
200
Imagine you had two batteries wired in series and two bulbs. How much electric current is flowing through one bulb?
1.5 Volts of Power to one out of two bulbs wired in series.
300
What is an advantage of connecting of connecting bulbs in parallel?
If one battery dies the circuit is still closed, because there is more than one path. Each bulb also gets all the power because each bulb has its own bath and aren't sharing the power.
300
What are four good conductors?
Aluminum, copper, gold, silver
300
Why is an electromagnet considered temporary?
If your power source goes out or gets disconnected your iron core is no longer magnetic.
300
What is a filament?
The part of a light bulb that glows when an electric current passes through it.
300
Imagine you had two batteries wired in parallel and two bulbs wired in parallel. How much current is flowing through each bulb?
2 batteries wired in parallel + two bulbs wired in parallel = 3.0 Volts of Power per a bulb
400
What is an advantage of connecting batteries in parallel?
If one battery dies the circuit is still complete/closed. There is more than one path.
400
What are three good insulators?
Rubber, plastic, glass
400
What are three ways to make an electromagnet stronger?
Wrap the wire more times, stronger power source (more batteries and voltage), larger iron core
400
What is the difference between an open and closed circuit?
An open circuit does not allow an electric current to flow because the path is not complete. A closed circuit has a complete path along which an electric current flows.
400
Imagine you had 2 batteries wired in parallel and two bulbs wired in parallel. How many different paths are there for the electrons?
2 batteries wired in parallel + two bulbs wired in parallel = 4 paths for the electrons
500
1. What is an advantage for connecting bulbs in series?
2. What is a disadvantage of connecting batteries in parallel?
1. There is less wire and lights get brighter by adding another power source.
2. The lights don't get brighter because the volts/electrons aren't combined.
500
1. How are batteries connected differently in a parallel circuit than in a series circuit.
2. Do you know what would happen if you had two bulbs wired in series and the second one burned out?
1. In parallel circuits each battery has its own path and it can often involve more wires. In a series circuit the batteries electrons and volts of power are combined creating one single path.
2. When one bulb goes out in a series circuit the circuit is open because there is only one path and the electric current cannot flow through.
500
1. What are four uses for an electromagnet?
Lift cars in a junk yard, clean up nails and medal scraps on construction sites, small motors in hair dryers and toys, doors to the modular, MRI
500
1. What is the difference between a parallel circuit and a series circuit?
2. What is the difference between and insulator and conductor?
1. A parallel circuit connects several objects so that the current for each object has its own path. A series circuit connects several objects one after another so that the current flows in a single path.
2. An insulator is a material that does not allow an electric current to flow/pass easily through it: used to protect us from electric current. A conductor is a material that allows an electric current to easily flow/pass through it.
500
1. Imagine you had two batteries wired in series and two bulbs wired in parallel. What would happen if the second bulb burned out?
2. Imagine that you had three batteries wired in series and three bulbs wired in parallel. How much current is flowing through each bulb?
1. Two batteries and two bulbs wired in parallel - one bulb that blew out = one closed and complete path left
2. Three batteries wired in series + three bulbs wired in parallel = 4.5 Volts of Power for each bulb