Electrical Appliances Quiz

Which of the following is an example of an electrical system mentioned in the text?

• An ECG machine connected to probes, the body, and electrical mains.

• A car engine running on petrol.

• A bicycle moving on a road.

• A book being read by a student.

What does a closed circuit allow in the context of an ECG machine?

• It allows the ECG machine to work when the probes, body, and electrical mains are connected.

• It prevents the ECG machine from functioning.

• It only lights up a bulb.

• It disconnects the electrical system.

Why do scientists and engineers use diagrams with symbols when inventing or constructing electrical appliances?

• To represent different components of an electrical system.

• To make the appliances look attractive.

• To confuse users.

• To reduce the cost of appliances.

What does the diagram illustrate about the ECG machine?

• It shows that a closed circuit is necessary for the ECG machine to function.

• It shows how to build an ECG machine.

• It shows the inside of a mobile phone.

• It shows a battery being charged.

What happens in an electrical system when the switch is open?

• The bulb lights up.

• The bulb does not light up.

• The cell is disconnected.

• The wires melt.

If the switch in an electrical circuit is closed but the bulb does not light up, what could be a possible reason?

• The cell is not storing chemical potential energy.

• The wires are not connected properly.

• The nervous system is not working.

• The circuit is open.

What can result from a disruption in the transmission of electrical signals in the nervous system?

• The bulb lights up.

• Disorders such as epilepsy and multiple sclerosis.

• The switch closes automatically.

• The cell becomes positive.

Which of the following is NOT a main component of an electrical system?

• Cell

• Electric charge

• Water wheel

• Wires

In the analogy between an electrical system and a water-in-pipe system, what does the "pump" in the water system represent in the electrical system?

• Bulb

• Cell

• Wire

• Water wheel

What is the SI unit of electric current?

• Volt

• Ohm

• Ampere

• Watt