Electromagnetic Induction and Transformers Quiz

What is the primary function of a transformer in daily life?

• To store electrical energy

• To convert electrical energy into mechanical energy

• To generate electricity

• To change voltage levels

In an ideal transformer, what is the efficiency percentage?

• 90%

• 100%

• 75%

• 50%

What happens to energy in a non-ideal transformer?

• Some energy is lost as heat

• Energy is converted to light

• Energy is stored for later use

• It is completely conserved

What is a step-up transformer used for?

• Increasing voltage

• Decreasing voltage

• Converting AC to DC

• Stabilizing voltage

In a step-down transformer, how does the primary voltage compare to the secondary voltage?

• Primary voltage is zero

• Primary voltage is equal

• Primary voltage is lower

• Primary voltage is higher

If a transformer has an efficiency of 60%, what does this imply?

• The transformer is ideal

• 60% of the input power is converted to output power

• 60% of the input power is lost

• The transformer is not functioning

How do you calculate the power output of a transformer?

• Voltage plus current

• Voltage times current

• Current divided by voltage

• Voltage minus current

What adjustment is needed if a device's voltage specification does not match the transformer's output?

• Calculate the new power output using a formula

• Adjust the power input

• Use a different transformer

• No adjustment is needed

What is the effect of increased heat in a transformer?

• Increased energy loss

• Decreased energy loss

• No effect on energy

• Increased efficiency

How is the efficiency of a transformer calculated?

• Output voltage divided by input voltage times 100%

• Input power divided by output power times 100%

• Input voltage divided by output voltage times 100%

• Output power divided by input power times 100%