F5 Chapter 4.3 Transformer

Which statement me low is true about a step down transformer?

• Output current is greater then input current

• Output power is greater then input power

• Output voltage is higher than input voltage

• Output voltage is lower then input voltage

• 0.2A

• 1.2A

• 5.0A

• D8.0A

Diagram shows a step-down transformer with two identical bulbs P and Q. Which comparison of the brightness of the bulb P and Q is correct?

• Brightness of P= Brightness of Q

• Brightness of P< Brightness of Q

• Brightness of P> Brightness of Q

• Non of them is correct

Diagram below shows the 12v bulb is connected to the secondary coil of a step-down transformer. Which transformer will light up the 12v bulb at its normal brightness?

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Calculate the voltage output in the diagram below

• 32V

• 600V

• 96V

• 0V

Diagram below shows a ideal transformer. Find the current flow through the resistor of 48W.

• 0.025A

• 16A

• 8A

• 48A

A transformer has an efficiency of 80%. Its primary coil is connected to a 240V power supply. If the output power is 96W, how much is the current flow through the primary coil?

• 0.32A

• 0.4A

• 0.5A

• 2.4A

Which of the following is a way to reduce heat losses in a transformer?

• The core is made of steel instead of soft iron

• The wires in the coils are insulated.

• The secondary coil is wound on top of the primary coil.

• Direct current if used instead of alternating current.

In a transformer, what type of wire and why soft iron is used?

• Thin copper wire, Eddy currents

• Thin iron wire, hysteresis

• Thick copper wire, hysteresis

• Thick copper wire hysteresis

Which of the following is the use of a step down transformer in daily life?

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