 ## Electrical Fundamentals 1. Which one of the following gives the units of electric charge? a) Amperes b) microns c) Coulmbs d) electrons 2. A current of 62.5 mA is the same as: a) 0.00625 A b) 0.0625 A c) 0.625 A d) 6.25 A 3. A frequency of 3.75 MHz is the same as: a) 37.5 kHz b) 375 kHz c) 3,750 kHz d) 37,500 kHz 4. Which one of the following statements is TRUE? a) Electrons and protons are both neutral b) Electrons carry a negative charge but protons carry no charge c) Electrons carry a positive charge and protons carry an equal negative charge d) Protons carry a positive charge and electrons carry an equal negative charge 5. Potential difference is measured in: a) Amps b) Joules c) Ohms d) Volts 6. Which one of the following metals is the best conductor of electric current? a) aluminium b) copper c) silver d) steel 7. The force between two charges is proportional to: a) the sum of the two charges b) the ratio of the two charge c) the product of the two charges d) the difference of the two charges. 8. The relative permittivity of free space is: a) zero b) 1 c) between 1 and 10 d) between 10 and 100 9. Which of the graphs below (showing flux density plotted against magnetising force) is typical of steel?  a) A b) B c) C d) D 10. Which of the diagrams below shows the magnetic field around a coil carrying an electric current?  a) A b) B c) C d) D 11. Which one of the components shown below is a toggle switch?  a) A b) B c) C d) D 12. What do the symbols marked X and Y represent?  a) X represents an earth connection, Y represents a chassis connection b) X represents a chassis connection, Y represents an earth connection c) X represents a battery connection, Y represents a power supply connection d) X represents a power supply connection, Y represents a battery connection. 13. In the circuit shown below, what type of switch is S1?  a) DPDT b) DPST c) SPDT d) SPST 14. A signal has a frequency of 400 Hz. Which one of the following gives its periodic time? a) 2.5 ms b) 25 ms c) 250 ms d) 400 ms 15. A capacitor has a marked value of 47,000 pF. This is the same as: a) 0.0047 uF b) 0.047 uF c) 4.7 nF d) 470 nF.
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