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WJEC A-Level Electronics Core Concepts overview quiz quiz

15questions. Pick an answer and you'll see why right away.

  1. In the systems approach, what do the arrows between blocks in a block diagram represent?

  2. Which sequence correctly describes the simplest three-block system model?

  3. Ohm's law, V = IR, applies to a component only when:

  4. Two resistors of 6 ohm and 3 ohm are connected in parallel. The combined resistance is:

  5. Kirchhoff's first law is a statement of the conservation of:

  6. A potential divider has the output taken across R2. The output voltage is given by:

  7. An LDR is used as a light sensor. As the light level increases, its resistance:

  8. Why must an LED always have a resistor in series with it?

  9. A flyback (protection) diode is connected across a relay coil mainly to:

  10. The power dissipated in a resistor can be found from all of the following except:

  11. A relay is often used to switch a mains lamp from a low-voltage logic circuit because it:

  12. In a single series loop containing three resistors, the current is:

  13. To make a light-sensing system switch on in the dark rather than in the light, you should:

  14. What is the main reason for using a transistor as a driver between a logic gate and a motor?

  15. An interface between two sub-systems must match in: