If you’ve ever looked at your electrical panel and wondered what terms like volts, amps, and kilowatts (kW) actually mean, you’re not alone. Understanding these basic electrical concepts can help homeowners make informed decisions about backup generators, home upgrades, and energy usage.
Volts: Electrical Pressure
Volts (V) measure the electrical pressure pushing electricity through a circuit.
Think of volts like water pressure in a pipe.
Most homes in the United States receive:
- 120 volts for standard outlets and lighting
- 240 volts for larger appliances such as air conditioners, dryers, electric ranges, and standby generators
The higher the voltage, the more power can be delivered without increasing current.
Amps: Electrical Flow
Amps (A) measure the amount of electrical current flowing through a circuit.
Using the water analogy, amps are similar to the amount of water flowing through a pipe.
The more amps being used, the more electrical load is being consumed by your home.
Watts and Kilowatts: Actual Power
Watts (W) measure the actual amount of power being used.
The relationship is simple:
Watts = Volts × Amps
For example:
- 120V × 10A = 1,200 watts
- 240V × 20A = 4,800 watts
A kilowatt (kW) equals 1,000 watts.
Examples:
- 5,000 watts = 5 kW
- 13,000 watts = 13 kW
- 20,000 watts = 20 kW
This is the number generator manufacturers use when rating generator output.
What Does a 200-Amp Electrical Service Mean?
Many homeowners are surprised to learn that a 200-amp electrical service does not mean their home constantly uses 200 amps.
A typical residential service is rated at:
- 200 amps
- 240 volts
This means the service can safely deliver up to:
200A × 240V = 48,000 watts (48 kW)
This is the maximum capacity of the electrical service, not the home’s normal usage.
Think of it as the size of the highway—not the number of cars currently driving on it.
How Much Power Does a Home Actually Use?
Most homes use far less than their maximum electrical capacity.
Where Does Your Electricity Come From?
Electricity follows a long path before reaching your home:
- A power plant generates electricity.
- High-voltage transmission lines move power long distances.
- Substations reduce voltage.
- Neighborhood transformers lower voltage again.
- Electricity travels through the meter and into your electrical panel.
The utility meter serves as the connection point between the utility company and your home’s electrical system. It measures energy usage while delivering power into the house.
How Is Electricity Produced?
Most electricity is generated by spinning a generator.
Different energy sources accomplish this in different ways:
- Natural gas burns to spin turbines.
- Nuclear plants create steam that spins turbines.
- Hydroelectric dams use flowing water.
- Wind turbines use wind energy.
Although the fuel source may differ, the principle remains the same: spinning a generator creates electricity.
Does Natural Gas Power My Home?
Yes—but in two different ways.
Natural gas can:
- Directly fuel appliances such as furnaces, water heaters, stoves, and fireplaces.
- Be used at power plants to generate electricity for the grid.
This means many homes are using natural gas both directly and indirectly every day.
Why Does the Power Go Out but Natural Gas Stays On?
The electrical grid and natural gas systems operate differently.
Electrical outages are commonly caused by:
- Storm damage
- Fallen trees
- Damaged transformers
- Utility equipment failures
Natural gas, however, is delivered through a pressurized pipeline network that often remains operational during electrical outages.
This is one reason standby generators are so popular.
When utility power fails, the generator uses natural gas to produce electricity for the home.
Can Natural Gas Power Outlets?
Not directly.
Your outlets require electricity, not fuel.
To power outlets with natural gas, a generator must convert the fuel into electricity.
The process works like this:
Natural Gas → Generator → Electrical Panel → Home
Without a generator, natural gas can provide heat and fuel appliances, but it cannot directly power lights, outlets, or electronics.
Why Generator Sizing Depends on More Than Panel Size
A common misconception is that a home with a 200-amp panel automatically requires a 48kW generator.
In reality, generator sizing depends on the loads you want to run during an outage.
Important considerations include:
- Number of air conditioners
- Gas or electric heat
- Electric water heaters
- Well pumps
- Septic systems
- Electric ranges and dryers
- Pool or hot tub equipment
Many homes with 200-amp service operate comfortably on:
- 13kW standby generators
- 17kW standby generators
- 20kW standby generators