AC and DC Electricity Quiz

Which type of current do the electrons flow in one direction only?

• DC

• None of the above

• AC

• Both AC and DC

What type of electricity is used for a washing machine?

• None of the above

• Both AC and DC

• AC

• DC

Answer explanation

Many appliances will use a combination of AC and DC. For example, a washing machine will use AC for the induction motor which is used to spin the tub with the clothing but the circuit board which controls the settings, will use DC power.

What device is used to convert AC to DC?

• Transformer

• Inverter

• Rectifier

• Converter

What is used to convert DC to AC?

• Inverter

• Transformer

• Rectifier

• Converter

What type of electricity is used for the circuit boards of small electronic devices like laptops and mobile phones?

• None of the above

• Both AC and DC

• AC

• DC

Why is AC electricity mostly used for transporting electricity over long distances?

• It is easier to convert to DC

• It is safer

• It is easier to control

• It is more efficient

What is the main disadvantage of DC electricity?

• It cannot be easily converted to AC

• It cannot be transported over long distances efficiently

• It is not safe

• It cannot be used for electronic devices

Which device is used to step up or step down AC voltages?

• Rectifier

• Inverter

• Transformer

• Converter

What type of current do the electrons change direction periodically?

• DC

• None of the above

• AC

• Both AC and DC