Open and Closed Circuits

Electrical lights will not come on unless their electrical circuit is a --

• parallel circuit

• series circuit

• closed circuit

• short circuit

Answer explanation

Electrical lights require a closed circuit to function, meaning the circuit must be complete for electricity to flow. In a closed circuit, all components are connected, allowing the lights to turn on.

Will the light bulb in this circuit light and why/why not?

• yes, because it has two batteries

• no, because the switch is open

• yes, because it is in a circuit

• no, because the bulb is burned out

Answer explanation

The light bulb will not light because the switch is open, which breaks the circuit. Without a closed circuit, electricity cannot flow to power the bulb.

What would happen if the switch was opened?

• nothing, the light bulbs would still work because there is a complete path

• The light bulbs would not work because the path was broken

• the battery would loose energy

• the wires would be cooled from air

Answer explanation

When the switch is opened, the circuit is broken, preventing current from flowing. As a result, the light bulbs will not work because there is no complete path for electricity to travel.

The on switch shows

• An open circuit where electricity can flow

• A closed circuit that is also called complete

• not related to circuits

• An incomplete circuit that does not allow electricity to flow

Answer explanation

The 'on' switch indicates a closed circuit, allowing electricity to flow. This is also referred to as a complete circuit, distinguishing it from open or incomplete circuits where electricity cannot flow.

A open circuit allows charges to flow. 

• True 

• False

Answer explanation

An open circuit does not allow charges to flow because it is incomplete, meaning there is a break in the path. Therefore, the statement is False.

Which statement is true?

• The light bulb will light up because the  circuit is complete.

• The light bulb will light up because the  circuit is broken.

• The light bulb will not light up because the  circuit is complete.

• The light bulb will not light up because the  circuit is broken.

Answer explanation

The correct statement is that the light bulb will not light up because the circuit is broken. A broken circuit means there is no complete path for electricity to flow, preventing the light bulb from lighting.

A circuit in which energy can freely flow.

• Closed Circuit

• Free Circuit

• Open Circuit

• Energy Circuit

Answer explanation

A closed circuit allows energy to flow freely through a complete path, enabling devices to operate. In contrast, an open circuit interrupts the flow, while 'Free Circuit' and 'Energy Circuit' are not standard terms.

Choose the corrrect sentence.

• This circuit will work because it is an open circuit

• This circuit will work because it is a closed circuit.

• This circuit will NOT work because it is an open circuit.

• This circuit will NOT work because it is a closed circuit.

Answer explanation

A closed circuit allows current to flow, enabling the circuit to work. An open circuit interrupts the flow, preventing operation. Therefore, the correct choice is that the circuit will work because it is a closed circuit.

Choose the correct sentence.

• This circuit will work because it is an open circuit.

• This circuit will work because it is a closed circuit.

• This circuit will NOT work because it is an open circuit.

• This circuit will NOT work because it is a closed circuit.

Answer explanation

An open circuit does not allow current to flow, meaning it cannot work. Therefore, the correct choice is that the circuit will NOT work because it is an open circuit.

Would would best complete this circuit?

• A wire

• A switch

• A battery

• A light bulb

Answer explanation

A battery is essential to complete the circuit as it provides the necessary electrical energy. Without a battery, the circuit cannot function, while a wire, switch, or light bulb alone cannot create a complete circuit.