David Okonkwo
Mechanical Engineer
About David
David is a mechanical engineer with a focus on energy systems. He has experience in the renewable energy sector and now consults on home energy efficiency. His writing breaks down engineering concepts using practical household examples, making topics like electricity consumption and heating systems genuinely understandable.
Articles by David
Guide
Insulating Your Home: Where to Start and How Much You Need
Calculate your insulation needs room by room, understand how BTU losses drive your heating bills, and compare the cost of a heat pump upgrade against your current system.
David Okonkwo Guide
Sunrise, Sunset, and Golden Hour: Planning Around Natural Light
Find exact sunrise and sunset times for your location, track how day length changes through the year, and calculate golden hour for photography, solar planning, or outdoor activities.
David Okonkwo Guide
Ohm's Law Made Simple: Voltage, Current, and Resistance Explained
Understand the fundamental relationship between voltage, current, and resistance — with calculators to solve circuits and size wiring safely.
David Okonkwo Guide
Dressing for the Weather: Wind Chill, Heat Index, and What the Forecast Doesn't Tell You
Understand how wind chill, heat index, and dew point affect what the temperature actually feels like — and dress accordingly.
David Okonkwo Guide
Heating and Cooling: How BTUs Work and How Many You Need
Understand what BTUs actually measure, how to size a heater or air conditioner for your space, and why getting it right saves energy and money.
David Okonkwo Guide
Understanding Your Home Electricity Bill and How to Lower It
Decode your electricity bill, understand kilowatt-hours and BTUs, and find the appliances that are costing you the most — with calculators to run the numbers.
David Okonkwo