Electrical Fundamentals


1. Which one of the following gives the units of electric charge?




2. A current of 62.5 mA is the same as:




3. A frequency of 3.75 MHz is the same as:




4. Which one of the following statements is TRUE?




5. Potential difference is measured in:




6. Which one of the following metals is the best conductor of electric current?




7. The force between two charges is proportional to:




8. The relative permittivity of free space is:




9. Which of the graphs below (showing flux density plotted against magnetising force) is typical of steel?






10. Which of the diagrams below shows the magnetic field around a coil carrying an electric current?






11. Which one of the components shown below is a toggle switch?






12. What do the symbols marked X and Y represent?






13. In the circuit shown below, what type of switch is S1?






14. A signal has a frequency of 400 Hz. Which one of the following gives its periodic time?




15. A capacitor has a marked value of 47,000 pF. This is the same as:




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