Gr 9 NATURAL SCIENCES: CH 3.7 SUM Cost of Electrical Power
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Questions and Answers

What is the total energy charge for a household that consumes 252 kWh in a month?

  • R2075.59
  • R2075.90
  • R20.76
  • R207.59 (correct)

    • What is the unit of power equal to one joule of energy per second?

  • Kilowatt (kW)
  • Ampere (A)
  • Joule (J)
  • Watt (W) (correct)

    • What is the purpose of conducting a household energy survey?

  • To calculate the cost of energy consumption
  • To reduce energy consumption
  • To compare energy prices between different providers
  • To understand household energy consumption (correct)

    • What is the energy charge for the first 50 kWh of energy consumption in a month?

    <p>69.35 c/kWh</p> Signup and view all the answers

    What is the formula to calculate the power of an electrical device?

    <p>power = energy / time</p> Signup and view all the answers

    What is the total cost of using a 1500 W microwave for 1 hour?

    <p>R1.07</p> Signup and view all the answers

    What is the environmental levy for energy consumption in block 2?

    <p>2.28 c/kWh</p> Signup and view all the answers

    What is the power rating of an electric pan?

    <p>1400 W</p> Signup and view all the answers

    What is the total cost of using a 2200 W fridge for 24 hours?

    <p>R37.83</p> Signup and view all the answers

    What is the energy charge for energy consumption above 600 kWh in a month?

    <p>139.31 c/kWh</p> Signup and view all the answers

    What is the term for the amount of electrical energy used by an appliance or device?

    <p>Power Consumption</p> Signup and view all the answers

    What is the primary electricity supplier in South Africa?

    <p>Eskom</p> Signup and view all the answers

    What is the unit of energy equal to one kilowatt (1 kW) of power used for one hour?

    <p>Kilowatt-hour</p> Signup and view all the answers

    What is the formula to calculate the energy consumption of an appliance?

    <p>Energy = Power x Time</p> Signup and view all the answers

    What is the term for a price schedule or rate for services provided?

    <p>Tariff</p> Signup and view all the answers

    What is the term for a pricing structure where the rate increases with higher consumption levels?

    <p>Tiered Tariff</p> Signup and view all the answers

    How is energy consumption often measured?

    <p>Kilowatt-hours</p> Signup and view all the answers

    What is the term for a device that uses electrical energy to perform a function?

    <p>Electrical Appliance</p> Signup and view all the answers

    How does Eskom charge consumers?

    <p>Based on a tiered tariff system</p> Signup and view all the answers

    What is the purpose of calculating energy consumption in kWh?

    <p>To make it easier to calculate energy consumption for a month</p> Signup and view all the answers

    Which unit of measurement is used to calculate the energy consumption of an appliance?

    <p>Kilowatt-hours</p> Signup and view all the answers

    What is the purpose of a tiered tariff system in electricity billing?

    <p>To charge higher rates for higher usage</p> Signup and view all the answers

    How is the energy consumption of an appliance calculated?

    <p>Power x Time</p> Signup and view all the answers

    What is the term for a tax added to the value of goods and services?

    <p>VAT</p> Signup and view all the answers

    What is the primary electricity supplier in South Africa?

    <p>Eskom</p> Signup and view all the answers

    What is the unit of measurement for power?

    <p>Watts</p> Signup and view all the answers

    Why is energy consumption often measured in kilowatt-hours (kWh) instead of joules?

    <p>Because kWh is a more practical unit for monthly consumption</p> Signup and view all the answers

    What is the term for the amount of electrical energy used by an appliance or device?

    <p>Energy Consumption</p> Signup and view all the answers

    What is the formula to convert joules to kilowatt-hours?

    <p>Joules / 3600</p> Signup and view all the answers

    What is the purpose of estimating energy consumption?

    <p>To approximate the energy used by an appliance or device</p> Signup and view all the answers

    What is the energy charge for a household that consumes between 351 and 600 kWh in a month?

    <p>124.74 c/kWh</p> Signup and view all the answers

    How is the power of an electrical device typically calculated?

    <p>power = energy / time</p> Signup and view all the answers

    What is the primary factor affecting the total cost of energy consumption for a household?

    <p>Total monthly energy consumption</p> Signup and view all the answers

    What is the purpose of looking at the power ratings of appliances?

    <p>To calculate the cost of operating the appliance over time</p> Signup and view all the answers

    What is the relationship between watts and kilowatts?

    <p>1 kilowatt is equal to 1000 watts</p> Signup and view all the answers

    What is the benefit of using energy-efficient appliances?

    <p>They consume less energy</p> Signup and view all the answers

    What is the unit of measurement for the total cost of energy consumption?

    <p>Rands</p> Signup and view all the answers

    What is the term for the rate at which electrical energy is supplied or consumed by a device?

    <p>Electrical power</p> Signup and view all the answers

    What is the term for a device that uses electrical energy to perform a function?

    <p>Appliance</p> Signup and view all the answers

    What is the primary purpose of understanding energy consumption in kWh?

    <p>To calculate the cost of energy consumption</p> Signup and view all the answers

    If a household consumes 420 kWh in a month, what is the total energy charge?

    <p>31,012.4 cents</p> Signup and view all the answers

    What is the energy consumption of a 200 W lamp used for 5 hours?

    <p>1 kWh</p> Signup and view all the answers

    If an appliance uses 2500 joules of energy in 5 seconds, what is its power rating?

    <p>500 W</p> Signup and view all the answers

    What is the total cost of using a 3000 W air conditioner for 2 hours, assuming an energy charge of 85.60 c/kWh?

    <p>R51.36</p> Signup and view all the answers

    What is the energy consumption of a device that uses 1200 W of power for 3.5 hours?

    <p>4.2 kWh</p> Signup and view all the answers

    If a household consumes 800 kWh in a month, what is the total cost, assuming an energy charge of 139.31 c/kWh?

    <p>R1,112.48</p> Signup and view all the answers

    What is the power rating of a device that consumes 3 kWh of energy in 2 hours?

    <p>1500 W</p> Signup and view all the answers

    What is the total cost of using a 250 W television for 8 hours, assuming an energy charge of 83.32 c/kWh?

    <p>R5.56</p> Signup and view all the answers

    What is the energy consumption of a 1200 W microwave used for 2.5 hours?

    <p>3.5 kWh</p> Signup and view all the answers

    If an appliance uses 4000 joules of energy in 10 seconds, what is its power rating?

    <p>400 W</p> Signup and view all the answers

    What is the primary purpose of using a tiered tariff system in electricity billing?

    <p>To charge higher rates for higher consumption levels</p> Signup and view all the answers

    What is the unit of energy consumption that is equivalent to one kilowatt of power used for one hour?

    <p>Kilowatt-hour (kWh)</p> Signup and view all the answers

    What is the primary factor affecting the total cost of energy consumption for a household?

    <p>The amount of electricity consumed</p> Signup and view all the answers

    What is the purpose of estimating energy consumption?

    <p>To provide a rough estimate of energy consumption for budgeting purposes</p> Signup and view all the answers

    What is the term for the rate at which electrical energy is supplied or consumed by a device?

    <p>Power</p> Signup and view all the answers

    What is the benefit of using energy-efficient appliances?

    <p>They reduce energy consumption and lower electricity bills</p> Signup and view all the answers

    Why is energy consumption often measured in kilowatt-hours (kWh) instead of joules?

    <p>Because kWh is a more practical unit for monthly energy consumption</p> Signup and view all the answers

    What is the term for a tax added to the value of goods and services?

    <p>VAT (Value-Added Tax)</p> Signup and view all the answers

    What is the primary purpose of conducting a household energy survey?

    <p>To identify opportunities to reduce energy consumption</p> Signup and view all the answers

    What is the relationship between watts and kilowatts?

    <p>One kilowatt is equal to 1000 watts</p> Signup and view all the answers

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