Calculations

Calculations

Increasing Resistance

The purpose of this section is to not simply discuss what a circuit is, or how resistors function, but more how do multiple resistors function within a circuit. It is important to discuss how these components function together because some projects may require the next step in electrical design to function properly.

The MAJORITY of projects can function properly and will not require multiple components within the circuit IF you use a variable voltage power supply.

Adding resistors and rheostats to a circuit become necessary when a design calls for a solid-state fixed voltage power supply or when using a large cell battery as the circuit’s power source.

The two main ways that components are placed within a circuit are called Series or Parallel.

Components are attached end-on-end in a straight line

Components have one common point of origin and termination.

PDF available for download

You may wish to print this PDF and follow along as you read through this next section.

Think of adding resistors in series is the same as adding more length to your NiChrome Wire.

Think of adding resistors in parallel is the same as adding more diameter to your NiChrome Wire.

Two components in parallel are a bit easier to calculate, by using this equation.

Ohm's Law

Resistance (Ohms) = Volts / Current (Amperes)

Joule's Law

Power (Watts) = Volts * Current (Amperes)

Let us not forget the electrical laws at play...

COMMON CURRENT

COMMON VOLTAGE

The amount of voltage applied to each individual component is referred to as the “Voltage Drop”.