1300

Current is

dQ/dt - the rate of flow of charge

Formula for Power (P)

P = V * I = dW/dt

On a diagram, you would draw the current moving

in the flow of the positive charge if they could move, or basically opposite way to the electrons when they’re moving

Kirchoff’s Voltage Law

The sum of Voltage Rises = The sum of Voltage drops

Kirchoff’s Current Law

The sum of current in a node = the sum of current out a node

If voltage and Current arrow are in the same direction

There is negative power —> meaningn supplying power

If voltage and current arrows are in the opposite directions

There is positive power —> power is being dissipated/used

Vbranch = Vy - Vx

where Vy and Vx are nodes

All points connected by a plain wire have the same voltage.

In series, voltage splits across resistors because the same current passes through different resistances, so each resistor uses up a different portion of the total voltage.

current always flows from high voltage to low voltage

nodes are the points where components join, not every corner of the drawing.

For series, Components share one node that only connects those two components (no branching at that point).

For parallel, Both components connect to the same two nodes.

To find Thevenin Resistance

Disconnect all sources and then calculate the resistance looking into the output port

To find Thevenin Voltage

Find voltage across the same node thing, and you can disregard the resistors that are connecting to the output/load line becaues there is no current flowing through them.

Formula for Energy stored in a capacitor

Formula for Energy stored in an inductor

When to use Nodal Analysis

Use when:

• Lots of parallel branches

• Many current sources

When to use Mesh analysis

se when:

• Circuit is mostly series loops

• Mostly voltage sources

• Planar circuit (no weird crossing wires)

Superposition

Use when:

• Multiple independent sources

• You only need one voltage or current

Thevenin Equivalent

V = Vth - I(Rth)

A parallel combination is always less than the smallest resistance in that specific parallel group

when you have two current sources in a circuit

use mesh, loko at 2023 exam

When tryna find Thevenin