Contents
- 1 What happens to an inductor when switch is closed?
- 2 How does closing a switch affect current?
- 3 What is the current in the circuit after the switch has been closed a long time?
- 4 What is the symbol of open switch?
- 5 What happens to the current in an inductor when the switch is opened?
- 6 When is the voltage across the inductor zero?
What happens to an inductor when switch is closed?
When the switch is first closed, the current through the inductor is zero, because it cannot change instantaneously. This means that the inductor acts like an open circuit, so all the voltage is across the inductor. When this happens, the current is no longer changing, so the voltage across the inductor is zero.
How does closing a switch affect current?
Closing the switch completes the conductive path in this flashlight, allowing electrons to flow. Sometimes open circuits are created by accident. You forget to connect a battery, for instance, or there’s a break in a wire somewhere in your circuit.
What is the current in the circuit after the switch has been closed a long time?
Long after the switch has been closed, what is the current in the 40Ω resistor? How does the current in the circuit change with time? Exponential discharge. The switch is in a for a long time, until the inductor is charged.
What is current when switch opens?
A device designed to open or close a circuit under controlled conditions is called a switch. The terms “open” and “closed” refer to switches as well as entire circuits. An open switch is one without continuity: current cannot flow through it.
Will an inductor dissipate energy?
These devices can deliver this stored energy, but cannot produce energy. Real capacitors and inductors, however, are not ideal, and will dissipate some power due to imperfections within the device (leakage within a capacitor, for example).
What is the symbol of open switch?
Electronic Switch Symbols
| Name | Description |
|---|---|
| Pushbutton Switch (N.O) | Momentary switch – normally open |
| Pushbutton Switch (N.C) | Momentary switch – normally closed |
| DIP Switch | DIP switch is used for onboard configuration |
| SPST Relay | Relay open / close connection by an electromagnet |
What happens to the current in an inductor when the switch is opened?
If current then starts to fall, the voltage on the inductor must reverse as a natural outcome of the maths. Theoretically after the switch is opened no current is flowing at all which would cause an infinite voltage Peak across the inductor.
When is the voltage across the inductor zero?
No because at t = 0, there is no current flowing through the inductor but there is a current flowing through both resistors. Extra credit: if the switch is closed for a long time, the voltage accross the inductor is 0.
What happens to the voltage when the switch is closed?
Extra credit: if the switch is closed for a long time, the voltage accross the inductor is 0. Hence no current is flowing through the 3kOhm resistor, and the current flowing through the inductor is 5/2k = 2.5mA. The switch is opened: the current flowing through the inductor is still 2.5mA.
Which is the starting value for an inductor?
For capacitors, this quantity is voltage; for inductors, this quantity is current. When the switch in a circuit is closed (or opened), the reactive component will attempt to maintain that quantity at the same level as it was before the switch transition, so that value is to be used for the ”starting” value.