Oracle Tutoring, Campbell River, BC
(250) 203-6544 (text) or (250) 830-0295 (talk)
Self-tutoring about electricity generation: the tutor describes the rate of 1MW: 1MegaWatt. Electricity consumption is typically measured in kWh (kiloWattxhours). A Watt is a rate of energy use: 1J/s. A kiloWatt is 1000J/s. In BC the average household consumption, per …
Self-tutoring about electricity and energy: the tutor mentions some units new to him. At an electricity generation plant, MWt means “megawatts thermal.” It measures the energy input. MWe means “megawatts electrical.” It’s the output. When burning fossil fuel such as …
Energy: electricity generation units: MWe vs MWt Read more »
Self-tutoring about electrical consumption: the tutor looks for the typical power rating of baseboard heaters. Investigating energy consumption, I was compelled to inquire about the wattage of baseboard heaters. Baseboard heaters, because of their variable length, are often discussed in …
Self-tutoring about wiring: the tutor inquires about where 208V supply might be found. Looking at the baseboard heaters the other day, I noticed they have two wattage ratings: one if in a 208V system, and one if in 240V. I …
Tutoring physics or chemistry, you might encounter Peukert’s Law, although it’s probably used more by industry. In my March 2 post I mentioned reserve capacity and Amp*hours as two ways to measure a battery’s potential output. Numerically they are convertible …
Tutoring chemistry, the distinction between cell and battery is noted. In electrochemistry, a cell is a single unit of electrical energy production. A cell comprises an anode and cathode, plus the ingredients and the environment needed for the chemical reaction …
The tutor explains which terminal is the anode, which is the cathode, as well as polarity. In terms of electrochemistry, oxidation occurs at the anode; reduction occurs at the cathode. Perhaps less obvious is the answer to the question, “Which …
Electrochemistry: cells and batteries: anode vs cathode Read more »
The tutor defines two terms relating to auto batteries. The reserve capacity (RC) of a car battery is given in minutes. It’s the duration the battery can discharge 25A at ≥ 10.5V. Ampere hours (Ah), on the other hand, is …
Auto batteries: reserve capacity vs Ah (Amp*hrs) Read more »
The tutor briefly explains the low-pass filter. This explanation draws on ideas from that of a high-pass filter (see my article here). A low-pass filter sends along low frequencies but blocks higher ones. The one we’re looking at today has …
AC Electricity, electronics: how a series low-pass filter works Read more »
The tutor gives background along with a basic explanation of how a high-pass filter works. A high-pass filter will send along high frequency signals but block low frequencies. It can do so because the impedance, Xc, of a capacitor of …
AC Electricity, electronics: series high-pass filter Read more »