Electricity

Electricity and Magnets Electricity 1Electricity 2Magnets 1Magnets 2Random FinalFinal QuestionQuestion

10 When Two objects have different electric Charges, they… Start a fire. Pull together. Push apart. Fall to earth Pull together

20 The purpose of insulation on an electric wire is to… Make the electric current stay on its path Heat the wire and generate energy Resist the flow of electricity and light up Close the circuit and make electricity flow Make the electric current stay on its path

30 Which of these substances is the best conductor of electricity? Air Rubber Plastic Metal

40 Electric current will flow through a circuit as long as the… Switch is open Charges are equal Path is unbroken Wires are insulated Path is unbroken

10 Which statement about a parallel circuit is correct? Each appliance or light has its own electrical path If one bulb is removed, the circuit will not work The power source is always an electromagnet Only one appliance or light ma be used at a time Each appliance or light has its own electrical path

20 Frayed or broken insulation is dangerous because it can… Prevent electricity from flowing Turn a parallel circuit into a series circuit Cause the power to be cut off Cause a fire or electric shock

30 A magnet is anything that… Has positive and negative charges Can pull iron and steel toward it Can create electricity Is present in the earth’s crust. Can pull iron and steel toward it

40 If a magnet is allowed to swing freely, the north- seeking pile will point… Up Down North South North

10 The northern lights are caused when The earth’s magnetic poles change places Charged particles form a pattern around the earth’s magnetic poles Electric power is generated from nuclear energy The sun’s energy becomes too intense and burns the forest in the far north. Changed particles form a pattern around the earth’s magnetic poles

20 Electric current can be generated by… Harnessing the magnetic energy in the earth’s atmosphere Attaching a compass to a lodestone Sliding a magnet back and forth through a coil of wire Capturing the flow of electricity with a meter Sliding a magnet back and forth through a coil wire

30 An electromagnet is created when ______ flows through a wire coil. Poles Electricity Negative charge A magnetic field Electricity

40 When you push the button on a doorbell, you are _______ a circuit. Opening Breaking Fixing Closing

10 As you rub a balloon on your sleeve, it picks up a ___________. Negative charge Magnetic field Positive charge Electric circuit Negativ e Charge

20 Current flows through an electric circuit as long as the path is _________. Broken Closed Unbroken Open Unbroken

30 If you sprinkle tiny pieces of iron over a magnet, the pattern formed shows a ___________. Electric circuit Magnetic field Power source Electricity Magnetic field

40 Magnetic force is strongest at a magnet’s ________. Power source Poles Magnetic field Electric circuit Poles

10 Electric generators have huge electromagnets plus a __________. Magnetic field Negative charge Power source Electric circuit Power source

20 Electromagnets are useful because they can be turned on or off by opening or closing an ____________. Switch Magnetic field Poles Electric circuit

30 When two objects have different electric charges, they ______ each other. Attract Close Pull away Open Attract

40 In a _________ circuit, each appliance or bulb has its own path for electricity to reach it. Single Double Parallel Electric Parallel

Final Question Explain why electro magnets are used in many electric appliances? They are useful because they can be turned on and off. When closed the appliance operates and when open, it stops

End of Show