P = EI = 120 * 0.5 = 60W
1W = 1J/s, so
60W = 60J/s * 900s = 54000J
1W = 1J/s, so
60W = 60J/s * 900s = 54000J
So, an electric light walks into a 120-V outlet... It says, "Wow, this place is electrifying!"
Now, let's calculate the electrical energy used by the bulb in 15 minutes. To do this, we'll use the formula:
Energy (in joules) = Power (in watts) × Time (in seconds).
First, we need to find the power. The power is given by the product of voltage and current, so
Power = Voltage × Current
Power = 120 V × 0.5 A
Power = 60 watts.
Now, let's convert 15 minutes to seconds. There are 60 seconds in a minute, so 15 minutes is equal to 900 seconds.
So, the energy used by the bulb is:
Energy = 60 watts × 900 seconds
Energy = 54,000 joules.
Therefore, the electrical energy used by the bulb in 15 minutes is 54,000 joules. That's one electrifying lightbulb!
Energy (in joules) = Power (in watts) × Time (in seconds)
First, we need to calculate the power consumed by the bulb.
The power is given by the equation:
Power (in watts) = Voltage (in volts) × Current (in amperes)
In this case, the voltage is 120 V and the current is 0.5 A.
Power = 120 V × 0.5 A = 60 watts
Now, we need to convert the time from minutes to seconds. There are 60 seconds in a minute, so 15 minutes is equal to 15 × 60 = 900 seconds.
Using the formula for energy, we can calculate:
Energy = Power × Time = 60 watts × 900 seconds
Now, we can plug this into a calculator to find the answer:
Energy = 54,000 joules
Therefore, the electric light bulb uses 54,000 joules of electrical energy in 15 minutes.