A transformer is used to provide a low-voltage supply for six outdoor garden globes. The circuit is shown in Figure 3. Assume there is no power loss in the connecting wires. All voltage values are RMS values. The input of the transformer is connected to a power supply that provides an AC voltage of 240 V. The globes in the circuit are designed to operate with an AC voltage of 12 V. Each globe is designed to operate with a power of 20 W. --- 2 WORK AREA LINES (style=lined) --- The globes are turned on. --- 4 WORK AREA LINES (style=lined) --- --- 4 WORK AREA LINES (style=lined) ---
PHYSICS, M6 2023 HSC 28
An ideal transformer is connected to a 240 V AC supply. It has 300 turns on the primary coil and 50 turns on the secondary coil. It is connected in the circuit with two identical light globes, \(X\) and \(Y\), as shown. --- 4 WORK AREA LINES (style=lined) --- --- 7 WORK AREA LINES (style=lined) ---
PHYSICS, M6 EQ-Bank 23
The diagram shows a circuit containing two ideal transformers connected with an ammeter. The current through the load is 5.0 A.
What is the reading on the ammeter? (3 marks)
PHYSICS, M6 2015 HSC 25b
The diagram shows a label on a transformer used in an appliance.
Explain why the information provided on the label is not correct. Support your answer with calculations. (3 marks)
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PHYSICS, M6 2015 HSC 18 MC
The diagram shows an ideal transformer.
When the switch is closed, the pointer on the galvanometer deflects.
How could the size of the deflection be increased?
- Decrease the number of primary coils
- Decrease the number of secondary coils
- Replace the iron core with a copper core
- Place a resistor in series with the galvanometer
PHYSICS, M6 2017 HSC 11 MC
An AC source is connected to a transformer having a primary winding of 900 turns. Connected to the secondary winding of 450 turns is a pair of parallel plates 0.01 m apart.
The AC input is shown in the graph.
What is the maximum field strength (in `text{V m}^(-1)`) produced between the plates?
- `1.7`
- `6.8`
- `1.7 × 10^4`
- `6.8 × 10^4`
PHYSICS M6 2022 HSC 1 MC
An ideal transformer has 20 turns on the primary coil and an input voltage of 100 V.
How many turns are there on the secondary coil if the output voltage is 400 V ?
- 4
- 5
- 80
- 400
PHYSICS, M6 2019 HSC 24
A step-up transformer is constructed using a solid iron core. The coils are made using copper wires of different thicknesses as shown.
The table shows electrical data for this transformer.
- Explain how the operation of this transformer remains consistent with the law of conservation of energy. Include a relevant calculation in your answer. (3 marks)
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- Explain how TWO modifications to this transformer would improve its efficiency. (4 marks)
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PHYSICS, M6 2021 HSC 7 MC
In a certain ideal transformer, the current in the secondary coil is four times as large as the current in the primary coil.
Which row of the table correctly identifies the type of transformer and the ratio of turns?