jpo said:Current decreases with time. Self induction has to presumably supply extra Amps to resist the change. Where will the energy com from to do all this?
Self-induction in a straight wire is the phenomenon where a changing current in a wire induces an opposing electromotive force (EMF) in the same wire. This is due to the magnetic field created by the changing current, which creates a self-induced EMF that opposes the original current.
Self-induction causes a delay in the growth or decay of current in a straight wire. This is because the self-induced EMF acts as a resistance to the original current, slowing down its change. This delay is known as inductance and is measured in henries (H).
The level of self-induction in a straight wire is affected by the length, diameter, and material of the wire, as well as the frequency and strength of the changing current. A longer wire or a wire with a larger diameter will have a higher level of self-induction, while a higher frequency or stronger current will result in a lower level of self-induction.
Self-induction can cause energy loss and reduce the efficiency of electrical devices. This is because the self-induced EMF creates a back current that opposes the original current, causing a decrease in the overall current. This decrease in current results in a decrease in power and efficiency.
Self-induction is used in a variety of everyday devices, such as transformers and inductors. These devices use self-induction to change the level of current and voltage in a circuit, making them essential components in electronic devices. Self-induction is also used in appliances with motors, such as refrigerators and washing machines, to regulate the speed and torque of the motor.