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Identify and explain the function of various components in an electrical circuit diagram, including an inductor, resistor, diode, and capacitor, and calculate total voltage.

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Fig 1C

i. Identify the parts labelled I, II, III and IV.

  • I: Inductor
  • II: Resistor
  • III: Diode
  • IV: Battery (or cells)

ii. Explain the relationship between the part III and V when the switch open.
Part III (diode) and Part V (capacitor) are connected in parallel with each other. When the switch is open, the circuit is incomplete, and no current flows from the battery to charge the capacitor or forward bias the diode. They are effectively isolated from the power source.

iii. What type of circuit connection exist between the part IV and V
Part IV (battery) is the power source for the circuit. Part V (capacitor) is connected in parallel across the load components (inductor, resistor, diode) which are powered by the battery.

iv. Explain the type(s) of biasing in the circuit above
The diode (Part III) is forward biased when the switch is closed. This is because the positive terminal of the battery (Part IV) is connected to the anode of the diode (via the switch, inductor, and resistor), and the negative terminal is connected to the cathode.

v. What is the role of the part labelled I in the circuit?
Part I is an inductor. Its role is to store energy in a magnetic field and to oppose changes in current flowing through the circuit.

vi. Calculate the total voltage of the cell

  1. Identify the voltage of each cell.

    The label on part IV indicates two cells, each with a voltage of 1.5 V1.5\, \text{V}.

  2. Determine the connection type.

    The cells are connected in series.

  3. Calculate the total voltage.

    For cells in series, the total voltage is the sum of individual cell voltages.

    Vtotal=1.5 V+1.5 V=3.0 VV_{\text{total}} = 1.5\, \text{V} + 1.5\, \text{V} = 3.0\, \text{V}

    The total voltage of the cell is 3.0 V\boxed{\text{3.0 V}}.

    Fig 1d

    State the product formed between:

    α\alpha. A and B
    A is Water, B is Milk.
    Product formed: Diluted milk (a mixture).

    β\beta. A and C
    A is Water, C is Salt.
    Product formed: Salt solution.

    γ\gamma. A and D
    A is Water, D is Powder.
    Product formed: If the powder is soluble, a solution is formed. If the powder is insoluble, a suspension is formed.

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