1.4.4. Resistors and Fuses

Try these first

1. 1.

   What does a resistor do in a high-power circuit?

   Hint

   Think about how it affects electrical energy.

2. 2.

   Why are fuses important in high-power circuits?

   Hint

   Consider safety in circuits.

3. 3.

   What is the main function of a fuse?

   • To limit current
   • To break the circuit during overcurrent
   • To enhance power efficiency

   Hint

   Think about why fuses are designed.

4. 4.

   True or False: Resistors create heat when current flows through them.

   • True
   • False

   Hint

   Consider the energy transfer in resistors.

5. 5.

   Calculate the power dissipated by a resistor with a resistance of 10 ohms when a current of 5 A flows through it. How will this affect circuit design?

   Hint

   Use the formula for power dissipation in resistors.

6. 6.

   You are designing a circuit that draws 20 A. What rating should the fuse have if we want it to blow at 25 A under fault conditions?

   Hint

   Think about the maximum expected current and a safe margin for fuse selection.