Engineering Essentials study guide

What is the symbol for a resistor?

A zig zag line

What is the symbol for a light bulb

a circle with a cross inside

R=

V/I

When resistors are side by side its called a

parallel

In a parallel the current

does not go to each resistor

The math for a series is

Rt= R1+R2+R3…

The math for a parallel is

1/Rt=1/R1+1/R2+1/R3…

In a parallel the voltage absorbed by each resistor is the

same (unless its a hybrid)

In a series the current is the…

same

The math for current (I) in a series is

I= Vt/Rt

Math for Vt in a series is

Vt= I x R

Junctions =

when 3 or more wires come together

lower Resistance =

higher current

If there is a junction then the circuit is

parallel

with an open circuit the current is

0

Insulator is the opposite of a

conductor

A conductor is a

material for energy to move through

Current is measured in

amps or A’s

The symbol for current is

I

The order for writing the symbol for a battery is

a big — then a small -

This image is a

Series

The symbol for a LED is

a line and a triangle with arrows