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A current of 2 A flows through a filament lamp. If the voltage across is 6 V, calculate its:

A current of 2 A flows through a filament lamp. If the voltage across is 6 V, calculate its: Power. Resistance. (Equations P =VI, R = V/I). This question is about current. Name an appliance used at home which makes use of the heating effect of the current.

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A current of 2 A flows through a filament lamp. If the voltage across is 6 V, calculate its:

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  1. A current of 2 A flows through a filament lamp. If the voltage across is 6 V, calculate its: Power. Resistance. (Equations P =VI, R = V/I)

  2. This question is about current. Name an appliance used at home which makes use of the heating effect of the current. What is the difference between alternating current and direct current? Changing alternating current to direct current is called _________________.

  3. An electric blanket of power 200 W is used for 6 hours. If 1 kWh costs 10 c, calculate the: Electrical energy used in kWh. cost in cents. (Equations Power = Energy/time)

  4. 4. This question is about fuses. What is the function of a fuse in a circuit? Draw the circuit symbol for a fuse. To which wire in the plug should the fuse wire be connected? Should the wire used in a fuse have a high or low melting point?

  5. The 3-pin plug has three wires inside. Name them and state the colour of insulation of each. Which wire is used as a safety measure to prevent electric shock? Which appliances do not require a 3-pin plug?

  6. Magnets have special properties. Name two properties of a magnet. State the law of the magnetic poles. Name the instrument used to show the direction of field lines. State one way by which a permanent magnet can be demagnetised.

  7. A A solenoid with a current passing through it has a magnetic field around it. Name the rule which is used to find the North pole of the solenoid. What pole will form in this case?

  8. Magnetic fields can have different shapes. Draw the magnetic field of a: bar magnet two like poles two unlike poles.

  9. b. a. A magnetic field forms around a current carrying conductor. Draw the resulting magnetic field in each case

  10. An electromagnet is temporary magnet which is dependent on current. Name: the material which is used to make an electromagnet. two ways by which it can be made stronger.

  11. Explain briefly how this relay works.

  12. Draw the apparatus required to test how the strength of an electromagnet depends on the current. Label all the apparatus.

  13. This question is about the catapult force. The wire experiences the greatest force when it is ___________ to the magnetic field. State the direction of the force in this case. State two ways by which the size of this force can be increased.

  14. A motor can be made to turn faster and a loudspeaker can be louder if three identical changes are made to each one of them. Name these changes.

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