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Questions and Answers
What is the unit of electrical resistance?
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?
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?
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?
What formula is used to calculate electrical energy?
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?
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?
What is the main purpose of Ohm's Law?
What is the main purpose of Ohm's Law?
If an appliance operates at 300 W, how much energy will it use in kWh if it runs for 24 hours?
If an appliance operates at 300 W, how much energy will it use in kWh if it runs for 24 hours?
How is electrical power calculated in a circuit?
How is electrical power calculated in a circuit?
What unit is used to measure electrical power?
What unit is used to measure electrical power?
If a 60 W bulb runs for 1,000 hours, how much energy does it consume in kWh?
If a 60 W bulb runs for 1,000 hours, how much energy does it consume in kWh?
What formula would you use to determine the cost of running an appliance given its usage in kWh?
What formula would you use to determine the cost of running an appliance given its usage in kWh?
How much energy does a 30 W appliance consume during 3 hours of usage?
How much energy does a 30 W appliance consume during 3 hours of usage?
At a rate of $0.15 per kWh, how much is spent to run a device for 500 kWh?
At a rate of $0.15 per kWh, how much is spent to run a device for 500 kWh?
A device with 0.5 kW power rating runs for 10 hours. What is the energy consumed?
A device with 0.5 kW power rating runs for 10 hours. What is the energy consumed?
What is the total annual cost if a device runs 24 hours a day for a year at 20 W?
What is the total annual cost if a device runs 24 hours a day for a year at 20 W?
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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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