unit 12

What is the difference between conductors and insulators?

• Conductors allow heat to pass through, insulators do not

• Conductors are always metals, insulators are always non-metals

• Conductors allow electricity to pass through, insulators do not

• Conductors are heavier than insulators

How is magnetism used to produce electricity?

• By heating up metals

• By using chemical reactions

• By moving a conductor through a magnetic field

• By compressing gases

What is one key difference between alternating current (AC) and direct current (DC)?

• AC flows in one direction, DC changes direction

• AC changes direction, DC flows in one direction

• Both AC and DC change direction

• Both AC and DC flow in one direction

What is a difference between series and parallel circuits?

• Series circuits have multiple paths, parallel circuits have one path

• Series circuits have one path, parallel circuits have multiple paths

• Both series and parallel circuits have multiple paths

• Both series and parallel circuits have one path

Which of the following is a form of Ohm’s law?

• Voltage = Current x Resistance

• Voltage = Current + Resistance

• Voltage = Current / Resistance

• Voltage = Resistance - Current

What is the formula for determining electrical power?

• Voltage x Current

• Resistance x Current

• Voltage / Resistance

• Current / Voltage

What is a solenoid?

• A type of capacitor

• A coil of wire that acts as a magnet when carrying electric current

• A device that stores electrical energy

• A type of transformer

How is voltage induced in the secondary circuit of a transformer?

• By direct contact with the primary circuit

• Through electromagnetic induction

• By increasing the resistance

• By using a capacitor

How does a capacitor work?

• It converts electrical energy into mechanical energy

• It stores electrical energy in an electric field

• It increases the current in a circuit

• It decreases the voltage in a circuit

What is a sine wave?

• A type of electrical circuit

• A mathematical curve that describes a smooth periodic oscillation

• A type of semiconductor

• A method for measuring electricity