To calculate the power of an AC circuit, you can use the formula P = V x I x cosφ, where P is power in watts, V is voltage in volts, I is current in amps, and cosφ is the power factor. In this case, the power would be 3A x 240V x 1 (assuming a power factor of 1 for a resistive load like a toaster), which equals 720 watts.
This formula can be used for any AC circuit as long as you know the values of voltage, current, and power factor. However, the power factor may vary depending on the type of load. For example, a motor would have a different power factor than a toaster.
The frequency of an AC circuit refers to the number of cycles per second, or Hz (hertz). In this case, a frequency of 50Hz means that the AC current oscillates back and forth 50 times per second.
Changing the current or voltage would directly affect the power of the toaster. Increasing the current would result in a higher power output, while increasing the voltage would also increase the power output. However, it is important to note that changing the voltage may also require adjusting the power factor in the calculation.
Yes, there is a maximum power limit for an AC circuit. This limit is determined by the maximum current and voltage that the circuit can handle without overheating or causing damage. It is important to always check the specifications of your circuit and appliances to ensure they are within the safe power limit.