# Circuit Fundamentals Flashcards

Ohm’s law

Current (I) is a proportion of voltage (E) and resistance (R)

What is the mathematical expression of Ohm’s law?

I = E/R

What is the basic power formula/Watt’s law?

The rate at which a load consumes energy is determined by current and voltage.

What is the mathematical expression of Watt’s law?

P = E x I

What is the mathematical formula for work?

W = P (a certain amount of power) x t (applied for a certain period of time)

In a series circuit, the total resistance is equal to ________.

The sum of the individual resistance within the circuit

In a series circuit, the current is ________.

The same throughout

The total voltage at the source of a series circuit is equal to _______.

The sum of the voltages at each of the resistor

What is the main disadvantage of series circuits?

A fault in the circuit stops the current in the entire circuit.

Branch

A pathway in a parallel circuit

What is the main advantage of parallel circuits?

A fault in any branch of the circuit doesn’t stop the current to other branches

The voltages across all branches of a parallel circuit are equal to _______.

The Source Voltage

The total current in a parallel circuit is equal to ___________.

Sum of the current flowing through each branch

The total resistance in a parallel circuit is ________________.

The reciprocal of the sum of the reciprocals of the separate resistances in parallel.

Complex circuit

Combines loads in parallel with loads in series in a single circuit

How do we analyze complex circuits?

By reducing the parallel circuits into an equivalent series circuit

As Current (I) increase, resistance __________

Decreases

Describe the Ohm’s Triangle

Current (I)

The continuous **flow** of free + electrons through a conductor

Voltage (V)

The motivating force, **PRESSURE**, causing electrical current

Current (I) is measured in …

Amps

As current increases, voltage…

Increases

Electron current flows from

Negative to Positive

Electron current flows from???

Negative to Positive

Voltage is expressed as…

V or I

Electric current is measured in…

Amps

Voltage is measured in…

Volts

Resistance is measured in…

Ohms

Voltage and Resistance are a measure of…

potential difference “between” or “across” two points in a circuit