Electrical Learning Hub

If you've ever wondered how a camera flash fires instantly, or how your phone charger smooths out rough power, the answer often comes down to one small but powerful component: the capacitor . In this post, we'll break down what capacitors are, how they store energy, and the key calculations every electrical student and technician should know. What Is a Capacitor? A capacitor is an electrical component that stores energy in the form of an electric field . It consists of two conductive plates separated by an insulating material called a dielectric . When voltage is applied across the plates, charge builds up — one plate becomes positively charged, the other negatively charged — and this separation of charge is what stores the energy. Unlike a battery, which stores energy chemically and releases it slowly, a capacitor stores energy electrostatically and can release it almost instantly. This is why capacitors are used anywhere a circuit needs a quick burst of power. The C...

Reading a Single-Line Diagram: Your First Step Into Electrical Drawings If you've ever stood in front of an electrical panel or a KPLC substation drawing and felt completely lost, you're not alone. Almost every electrician, technician, and engineering student in Kenya has had that moment staring at a page full of lines, circles, and strange symbols wondering where to even begin. The good news is that most of those drawings start from the same simple foundation: the single-line diagram (SLD) . Once you understand how to read one, every other electrical drawing becomes far easier to follow. This post breaks it down from scratch, using examples you'll actually recognize from sites here in Kakamega and across Western Kenya. What Exactly Is a Single-Line Diagram? A single-line diagram is a simplified representation of an electrical power system. Instead of drawing all three phases (or every individual conductor) separately, the whole circuit is shown as a single line....

  Running a small business in Kenya means juggling a lot — stock, staff, customers, rent. Electrical safety often gets pushed to the back of the list until something goes wrong: a fire, a damaged freezer full of stock, or a shock incident that could have been avoided. Having worked on commercial premises around Kakamega, here are the practical safety steps I recommend to every business owner, whether you're running a shop, salon, restaurant, or small workshop. 1. Get a Proper Load Assessment Before Adding Equipment A lot of electrical problems in small businesses start the same way: equipment gets added over time — a freezer here, a photocopier there, a new oven — without anyone checking if the wiring and distribution board can actually handle the combined load. What to do: Before adding any major appliance, have an electrician calculate your total connected load against what your circuits and main switch can safely carry. This is especially important for businesses with refrig...

 With how often power outages happen in many parts of Kenya, an inverter is one of the most common installations I get asked about — both for homes wanting to keep lights and a fridge running, and businesses that can't afford downtime. The problem is, a lot of buyers end up with the wrong size or type of system because they didn't know what to actually look for. Here's a practical breakdown. What an Inverter Actually Does An inverter takes DC power stored in a battery and converts it into AC power, which is what your home or business appliances run on. When KPLC power is available, the system charges the battery; when power goes out, it switches over (often automatically) to draw from the battery instead. The Key Components 1. The Inverter Itself Rated in VA (volt-amps) or watts — this tells you how much load it can power at once. A 1000VA inverter, for example, can handle a modest load: a few lights, a TV, a router, maybe a small fridge — but not heavy appliances like...

 Solar power comes up constantly in conversations with clients, especially with how frequent KPLC outages can be in parts of Western Kenya. But solar isn't a one-size-fits-all solution — it depends heavily on your usage patterns, budget, and goals. Here's a practical breakdown based on the installations and assessments I've worked on. How a Solar System Actually Works A basic solar power system has four main components: 1. Solar Panels — convert sunlight into DC electricity. Output is rated in watts (e.g., 300W panel) and depends on panel size, efficiency, and sunlight exposure. 2. Charge Controller — regulates the power flowing from the panels to the battery, protecting it from overcharging. 3. Battery Bank — stores energy for use when the sun isn't shining (night, cloudy days). Capacity is measured in Ah or kWh. 4. Inverter — converts the stored DC power into AC power that your home or business appliances actually use. Grid-Tied vs Off-Grid vs Hybrid System...

  One of the first things I had to get comfortable with on site was recognizing different cable types at a glance — not just by size, but by construction and intended use. Using the wrong cable type for the application is a common mistake that can lead to premature failure, fire risk, or code violations. Here's a practical rundown of the main cable types and where each one belongs. 1. PVC Insulated Single Core Cable This is the most basic and widely used cable for general wiring — a single conductor (usually copper) with PVC insulation. Where it's used: Internal house wiring run through conduit or trunking — lighting circuits, socket circuits, general distribution within walls or ceilings where the cable is protected from physical damage and moisture. Why it works: PVC insulation is cost-effective, reasonably durable, and adequate for indoor, protected installations. 2. PVC/PVC Twin and Earth Cable A flat cable containing two insulated conductors (live and neutral) plus...