Quiz Electricity

Why are most insulators used to keep people safe from electricity?

• They double the current

• They generate electricity

• They do not allow electrons to flow freely

• They change light energy into electrical energy

What is a conductor?

• A material that stops electricity from flowing

• A material that allows electrons to flow freely

• A non-metal that keeps people safe

• A device that stores electrical energy

What happens to the current in a series circuit when you add more lamps?

• It increases

• It stays the same

• It doubles

• It decreases

What effect does adding more cells (power supply) to a circuit have?

• It reduces the chemical energy

• It decreases the brightness of lamps

• It increases the current and brightness

• It turns thermal energy into chemical energy

What happens when electrons pass through a lamp in a circuit?

• The lamp stores the energy

• The electrons stop moving

• Electrical energy changes into light and thermal energy

• The electrons are destroyed

In a series circuit, what is true about the current (amps) measured at different points in the circuit?

• It is highest near the power supply and lowest at the end

• It changes depending on the number of components

• It is the same at every point in the circuit

• It only flows through the lamps, not the wires

What happens when scientists change a material that doesn’t usually allow electrons to flow freely so that it does?

• The material becomes heavier

• The electrons stop moving entirely

• The material acts more like a conductor, allowing electron flow

• The material turns into a gas

What is the product when magnesium (Mg) combines with oxygen (O₂)?

• Magnesium bioxide

• Magnesium hydroxide

• Magnesium oxide

• Magnesium carbonate