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Identify the device used to store electric charges.

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3 parts
a

–||–\text{--} \text{|} \text{|} \text{--}

b(i)

11100 shillings\text{11100 shillings}

b(ii)

740 days\text{740 days}

Step-by-step solution

7 steps

Here are the solutions for the questions:

Part a· 2 steps

  1. Identify the device used to store electric charges.

    A device used to store electric charges is a capacitor.

  2. Draw the circuit symbol for a capacitor.

    The circuit symbol for a capacitor is:

    –||–\boxed{ \text{--} \text{|} \text{|} \text{--} }

    Function: A capacitor stores electrical energy in an electric field between two conductive plates.

Part b(i)

11100 shillings\text{11100 shillings}

**The total cost of energy bought.

  1. Identify the amount of energy bought and the cost per unit.

    Energy bought = 7400 units.
    Cost per unit = 1.50 shillings.

  2. Calculate the total cost.

    Total Cost=Energy bought×Cost per unit\text{Total Cost} = \text{Energy bought} \times \text{Cost per unit} Total Cost=7400 units×1.50 shillings/unit\text{Total Cost} = 7400 \text{ units} \times 1.50 \text{ shillings/unit} Total Cost=11100 shillings\text{Total Cost} = 11100 \text{ shillings}

    The total cost of energy bought is 11100 shillings\boxed{\text{11100 shillings}}.

Part b(ii)

740 days\text{740 days}

**The number of days the heater can be used.

  1. Calculate the energy consumed by the heater per day.

    Power of heater (PP) = 2 kW.
    Time used per day (tt) = 5 hours.
    Energy consumed per day (EdayE_{\text{day}}) = P×tP \times t.

    Eday=2 kW×5 h=10 kWh/dayE_{\text{day}} = 2 \text{ kW} \times 5 \text{ h} = 10 \text{ kWh/day}

  2. Identify the total energy available.

    Total energy available (EtotalE_{\text{total}}) = 7400 units = 7400 kWh.

  3. Calculate the number of days the heater can be used.

    Number of days=EtotalEday\text{Number of days} = \frac{E_{\text{total}}}{E_{\text{day}}} Number of days=7400 kWh10 kWh/day\text{Number of days} = \frac{7400 \text{ kWh}}{10 \text{ kWh/day}} Number of days=740 days\text{Number of days} = 740 \text{ days}

    The heater can be used for 740 days\boxed{\text{740 days}}.

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