Voltage vs Amps vs Watts Explained: Simple Electricity Guide

EXPLAINING CURRENT, VOLTAGE, RESISTANCE THROUGH THE WATER ANALOGY

Volts, amps, and watts are the 3 core measurements of electricity. Water flowing through a pipe is the easiest way to picture this.

Voltage is the pressure pushing the water along, amps are how much water is actually flowing past a point each second, and watts are the total energy that pressure and flow add up to. Turn up either one and you get more power out the other end, that's really all watts describe, how much electrical work volts and amps are doing together.

Using a hose analogy helps visually explain the difference between volts, amps, and watts:

• Volts (voltage) refers to the electrical pressure, like how open or closed a tap is.
• Amps (current) measure the flow of electricity, similar to water running through the hose.
• Watts (power) represents amount of power used or produced, calculated by multiplying volts by amps.
• Ohms (resistance) refers to the amount electrical resistance, like how a hose can be restricted.

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WHAT ARE VOLTS? VOLTAGE (V) EXPLAINED AUSTRALIA

Voltage, measured in volts (V), is the electrical pressure pushing current through a circuit. More voltage means more force behind the electricity moving from one point to another, similar to higher pressure in a water pipe. Standard Australian household power runs at 230 to 240 volts, which is why that number shows up on appliance labels and circuit diagrams throughout this guide.

What is the Voltage formula? Voltage can be calculated by dividing the amount of power by the current. (watts ÷ amps = volts).

What Voltage do Transmission Lines Run at? Long-distance transmission networks can run up to 220 kilovolts (kV) or 220,000 Volts (V), which are designed to run at high-voltage and lower current to reduce power losses.

Think of voltage as the pressure pushing electricity through the wire.

WHAT ARE AMPS? AMPERAGE (A) / CURRENT EXPLAINED

Amps, short for amperes and written with the symbol A, measure the actual flow of current, how much electricity is moving past a point each second.

A small LED bulb draws a fraction of an amp, while something like an EV charger or an oven can pull well over 10 amps at once. Amperage is also what circuit breakers are rated for, a 16A breaker trips once the current running through it goes above 16 amps, regardless of the voltage behind it.

How to calculate current: Amps can be calculated by dividing watts by voltage. (Watts ÷ volts = amps).

Amps tell you how much electricity is flowing through a circuit.

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WHAT ARE WATTS? WATTAGE (W) & KILOWATTS (KW) EXPLAINED

Watts measure total electrical power, the actual rate of energy being used or delivered. Since power depends on both pressure and flow, watts are worked out by multiplying volts by amps.

It's the number you'll usually see on an appliance's label, because it tells you how much energy something draws rather than just how it draws it.

What's an Example of Watts? Using our hose example, power also applies to water where the amount of power is determined by the combined flow and pressure. Imagine your thumb over the hose nozzle, when the high flow is pressurised, it jets out a powerful flow; this is what electrical power is like.

What's the difference between W and kW? Watts and Kilowatts are both measurements of power. 1000W (watt) is equal to 1kW (kilowatt), which measures the amount of power being used or produced.

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WHAT ARE PHASES AND FREQUENCIES IN AUSTRALIA?

What does frequency (Hz) mean? Every home runs on alternating current at 50-60Hz. The frequency (Hz) is the number of times the alternating current switches direction per second.

What Voltage does Australia run at? Most Australian homes are generally single-phase, which runs at 230-240V per phase, with three-phase properties reaching 400V for more power. Voltage optimisation factsheet.

What is an electrical phase? A phase (Φ) is simply a method of delivering power to your property. The more phases, the more power can be delivered to homes and businesses that require a higher power output to use appliances like EV chargers or industrial equipment.

Using the water analogy to determine what a phase is, think of it like a single or three water pipes supplying your house. A solo pipe can only provide so much flow at a given time, and with some needing more than what that one pipe can supply, they can opt for more and upgrade to three-phase.

WHAT ARE REAL LIFE EXAMPLES OF VOLTAGE, CURRENT, AND WATTS?

Understanding amps, volts, and watts shouldn’t just be limited to the academics, but be something in the back of your mind to help you know how your appliances operate.

Appliances like EV chargers and kettles require a higher amount of power for their operation, which when used all at the same time, can trip circuit breakers which are designed to stop electricity flowing and protect your appliances from too much current.

Yes, you guessed it, let’s refer to our water analogy. Circuit breakers and fuses both stop the flow of water when too much water is going through the hose which is a safety guard for protecting your home.

The difference between a fuse and circuit breaker comes down to a fuse being the last resort and requires replacement when broken and a circuit breaker being resettable.

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WHAT IS GRID OVERVOLTAGE? HOW HOMES ARE PROTECTED FROM IT

Because voltage is the pressure pushing the electricity through your circuits, it is vulnerable to get too high or too low. When voltage gets too high, appliances are damaged, and too low means that it won’t work properly. Both not ideal.

As mentioned before, transmitting electricity long-distance requires high voltage over hundreds of thousands of volts... but how is this made suitable for homes?

What are electrical transformers? A very important part of the electrical system called the Transformer, is designed to step up or down the voltage to the required value. When reaching the end of the transmission line, transformers gradually step down the electricity’s voltage as it approaches your neighbourhood and house to the suitable amount.