Resistance of a hot metal

12 questions

1. Which of the following components is represented by the circuit symbol shown?
2. What happens to the current through a filament lamp as the p.d. across it is increased?
3. What is the resistance of a filament lamp if it has a current of 0.25 A when a p.d. of 0.5 V is applied across it?
4. Which of the following statements about the I–V graph of a filament lamp is correct?
5. If the p.d. across a filament lamp increases at a steady rate, how does the current through it change as the p.d. becomes higher?
6. What is the resistance of the filament lamp at a p.d. of 3.0 V, according to the I–V graph shown?
7. Which of the following components does the I–V graph shown represent?
8. Which of the following is an ohmic conductor?
9. Which of the following statements about ohmic conductors and non–ohmic conductors is correct?
10. In the model of a metal shown, what do the blue circles represent?
11. In the model of a metal shown, what do the black circles represent?
12. What happens to the electrons and metal ions when a metal is heated?

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