Electrical Calculation Quiz

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Questions and Answers

What is the unit of electrical resistance?

  • Ohm (correct)
  • Amp
  • Watt
  • Volt

If a television has a power rating of 50.4 W, how much energy does it consume in kWh if operated for 8 hours?

  • 0.504 kWh
  • 0.4032 kWh (correct)
  • 4.032 kWh
  • 5.04 kWh

How much does it cost to run a TV rated at 50.4 W for 30 days if the cost per kWh is $0.15?

  • $4.50
  • $60.00
  • $15.00
  • $210.24 (correct)

What formula is used to calculate electrical energy?

<p>E = P x T (B)</p> Signup and view all the answers

If an average light bulb rated at 60 W lasts for 1,000 hours, how much energy will it consume in kWh over its lifetime?

<p>60 kWh (C)</p> Signup and view all the answers

What is the main purpose of Ohm's Law?

<p>To determine the relationship between voltage, current, and resistance (B)</p> Signup and view all the answers

If an appliance operates at 300 W, how much energy will it use in kWh if it runs for 24 hours?

<p>7.2 kWh (A)</p> Signup and view all the answers

How is electrical power calculated in a circuit?

<p>Power = Voltage x Current (A)</p> Signup and view all the answers

What unit is used to measure electrical power?

<p>Watt (A)</p> Signup and view all the answers

If a 60 W bulb runs for 1,000 hours, how much energy does it consume in kWh?

<p>60 kWh (D)</p> Signup and view all the answers

What formula would you use to determine the cost of running an appliance given its usage in kWh?

<p>Cost = kWh x Rate (B)</p> Signup and view all the answers

How much energy does a 30 W appliance consume during 3 hours of usage?

<p>0.09 kWh (D)</p> Signup and view all the answers

At a rate of $0.15 per kWh, how much is spent to run a device for 500 kWh?

<p>$75 (D)</p> Signup and view all the answers

A device with 0.5 kW power rating runs for 10 hours. What is the energy consumed?

<p>5 kWh (D)</p> Signup and view all the answers

What is the total annual cost if a device runs 24 hours a day for a year at 20 W?

<p>$17.52 (A)</p> Signup and view all the answers

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Study Notes

Electrical Calculation

  • Ohm's Law defines the relationship between current (I), voltage (V), and resistance (R) in an electrical circuit.
  • Current (I) is the rate of electric charge flow measured in Amps (A).
  • Voltage (V) is the potential difference between two points in a circuit, measured in Volts (V).
  • Resistance (R) is the opposition to current flow, measured in Ohms (Ω).
  • Power (P) is the rate at which electrical energy is converted, measured in Watts (W).
  • Power companies calculate energy usage based on the formula E = P x T, where E is electrical energy, P is power in Kilowatts (kW), and T is time in hours.

Practice Examples

  • A television with a power rating of 50.4 Watts (W), operating for 8 hours per day consumes 0.4032 kWh (kilowatt-hours) per day.
  • At a price of $0.15 per kWh, the television would cost $0.0605 per day to operate.
  • A 300 Watt light bulb used for 24 hours a day consumes 7.2 kWh per day and 50.4 kWh per week.
  • A typical 60 Watt light bulb operating for its 1000-hour lifetime uses 60 kWh of energy.
  • At a price of 3 LE per kWh, the lifetime cost of the 60 Watt light bulb is 180 LE.

Ohms Law

  • Current measures the rate of electric charges, measured in Amps (A)
  • Voltage represents the potential difference between two points in a circuit, measured in Volts (V)
  • Resistance refers to the electrical friction that opposes current flow. It's measured in Ohms (Ω)
  • Power indicates the rate at which electrical energy converts into other forms of energy, measured in Watts (W)

Electrical Energy Calculation

  • Power companies sell electrical energy by calculating it using the formula: Energy = Power x Time (E=PxT)
  • Power needs to be measured in Kilowatts (KW), and time in hours.

Practice Sheet Examples

  • A television with a power rating of 50.4 Watts consumes 0.4032 kWh of energy per day if used for 8 hours.
  • The cost of running the TV for 30 days at 0.15perkWhis1728cents/monthor0.15 per kWh is 1728 cents/month or 0.15perkWhis1728cents/monthor210.24 per year.
  • A typical 60-watt light bulb consumes 60 kWh of energy over its lifetime, assuming a 1,000-hour lifespan.
  • The cost of the 60-watt bulb's energy over its lifetime is 180 LE/KWhr at 3 LE/KWh.

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