Charges
A _______________ and a positive charge will repel each other.
What is positive charge?
To demonstrate static electricity, a teacher takes an inflated balloon and rubs it against his hair. The rubber balloon picks up electrons from his hair which makes his hair have a _____________________ charge.
What is positive?
Increasing the number of batteries will __________________ the strength of an electromagnet.
What is increase?
See image: A group of compasses surround a copper wire that is part of a circuit. The compass needles will point north (in same direction) when there is ___________ current flowing through the wire.
What is "no"?
A device that can be used to open or close an electric circuit is called a _______________________.
What is switch?
A substance having more electrons than protons will have an overall _____________________ charge.
What is negative?
A positively charged object comes into contact with a neutral object and then separated. Describe the final result of net charges after they are separated.
What is both objects are positively charged?
Name some ways that we can increase the strength of an electromagnet.
What is increase number of coils, closeness of coils, or current?
A compass placed to the right of the south pole of a bar magnet will point in the ________________ direction.
What is north?
Identify the resistor in the diagram of a circuit.
What is a resistor?
Rubbing a balloon on hair is an example of static charge build up created by ___________________.
What is friction?
An example of a semiconductor.
What is silicon?
See doorbell image: The force that operates a doorbell is ___________________.
What is magnetism?
What is increasing?
Identify the power source in the diagram of a simple circuit.
What is the power source?
The closer the charges, the ___________________ the force between them.
What is stronger?
Rubber and wood are good examples of ____________________.
What is insulators?
An electric motor is a device that uses an electric current to turn an axle. In doing that, it transforms _____________ energy into mechanical energy.
What is electrical?
A magnet ______________ through a loop of wire will produce an electric current in the closed loop of wire.
What is passing?
The function of a resistor in an electrical circuit is to ___________________ the amount of current.
What is control?
Charged objects can be attracted to objects with _________________ charges.
What is opposite?
A material not allowing electrons to move freely (requiring large amounts of energy to make them move) is called a ________________________
What is an insulator?
A generator converts mechanical energy to electrical energy by using a conducting metal loop turning in a ____________________ field.
What is magnetic?
See electromagnet image:
When the switch is closed, a magnetic field will be ________________________.
What is produced?
Identify the switch and wires in the diagram of a simple circuit.
What is a wire and switch?