5. A thermistor is a type of resistor that allows more current to flow through it as its temperature rises. The symbol is:
6. Diodes are electronic components that only allow current to flow through them in one direction. The symbol is:
7. When diodes are connected to allow current to flow they are said to be in forward bias.
8. When diodes are connected in such a way that current cannot flow they are said to be in reverse bias.
9. A light emitting diode (LED) is a type of diode that lights up when current flows through it. The symbol is:
Questions and Exercises K C
Key Concepts Rewrite the following sentences in your copybook and fill in the blanks. 1. Electronics involves _____________, process and _____________ . 2. Resistors _____________ the _____________ flowing in a circuit. 3. Resistance is measured in _____________. 4. The coloured bands on a resistor tell the user what its _____________ is. 5. A _____________ _____________ _____________ is a type of resistor that lets more current flow when light falls on it.
6. A _____________ is a type of resistor that allows more current to flow through it when it gets hotter.
7. Diodes are electronic components that only allow _____________ to flow in _____________ _____________.
8. When current can flow through a diode it is said to be in ____________ _____________. 9. When a diode is connected so that it acts as an insulator it is said to be in _____________ _____________.
10. LED is short for _____________ _____________ _____________. 11. An LED is a type of _____________ that _____________ _____________ when current flows through it.
12. The positive leg of a diode is _____________ than the negative leg of a diode. 13. The flat edge of a diode is above the _____________ leg.
