4.5.6a Construction and operation of a transformer

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Question 33

State the name of each of the three wires inside a standard mains electricity power cable.

$…\dots$
$…\dots$
$…\dots$

[1]

The power cable of an appliance is designed for a maximum current of $A10\text{ A}$ . Suggest one hazard that could occur if a current of $A25\text{ A}$ flows through this cable.

[1]

There is a step-down transformer inside the appliance.

The input voltage to the primary coil $VpV_{\text{p}}$ [_]is $V240\text{ V}$ (a.c.).
The number of turns on the primary coil $NpN_{\text{p}}$ [_]is $800$ .
The number of turns on the secondary coil $NsN_{\text{s}}$ [_]is $50$ .

Calculate the output voltage $VsV_{\text{s}}$ [_]of the secondary coil.

[2]

The current in the input (primary) coil of the transformer is $A1.8\text{ A}$ . Calculate the electrical input power to the appliance.

[2]

State the name of each of the three wires inside a standard mains electricity power cable.

$…\dots$
$…\dots$
$…\dots$

[1]

The power cable of an appliance is designed for a maximum current of $A10\text{ A}$ . Suggest one hazard that could occur if a current of $A25\text{ A}$ flows through this cable.

[1]

There is a step-down transformer inside the appliance.

The input voltage to the primary coil $VpV_{\text{p}}$ [_]is $V240\text{ V}$ (a.c.).
The number of turns on the primary coil $NpN_{\text{p}}$ [_]is $800$ .
The number of turns on the secondary coil $NsN_{\text{s}}$ [_]is $50$ .

Calculate the output voltage $VsV_{\text{s}}$ [_]of the secondary coil.

The current in the input (primary) coil of the transformer is $A1.8\text{ A}$ . Calculate the electrical input power to the appliance.

[2]

4.5.6a Construction and operation of a transformer

Question 33

Markscheme

4.5.6a Construction and operation of a transformer

Question 33

Markscheme

4.5.6a Construction and operation of a transformer

Question 33

4.5.6a Construction and operation of a transformer Questions

4.5.6a Construction and operation of a transformer

Question 33

4.5.6a Construction and operation of a transformer Questions