Self-tutoring about electronics: the tutor looks at the resistance of semiconductors relative to change in temperature. Generally, semiconductors, such as silicon, lose resistance as temperature increases. This can be noticed as a negative temperature coefficient, since resistance reacts in the …
Self-tutoring about electronic devices: the tutor mentions thermistors. A thermistor is a device whose resistance is meant to vary with temperature. Some, called negative temperature coefficient (NTC) thermistors, decrease resistance with increasing temperature. Positive temperature coefficient thermistors do the opposite. …
Tutoring applied physics, terms from electronics might arise. The tutor mentions two related ones. An inverter, when relating to power supply, takes DC power and converts it to AC. A rectifier does the opposite. Source: exro.com arrow.com
Self-tutoring about how quickly a capacitor gains voltage: the tutor does a calculation. Today something came across the desk: estimate the charge on a capacitor, 1µF, assumed to have been of zero charge, after receiving current through 100kΩ for around …
Self-tutoring about electronics: the tutor mentions a product he’s noticed. A conductive pen, as I understand it, can draw a connection between two leads because its ink is conductive, containing silver or some other conductor. You can easily imagine the …
Self-tutoring about electronics and repair: the tutor mentions an observation. Apparently, the damage to a failed printed circuit board (pcb) may not be visible. While it often, or even usually is, it needn’t be in every case. Source: emsginc.com
Self-tutoring about home electronics: the tutor shares. Using a Smart TV today, I couldn’t get the web browser to work, even though the TV itself reported being connected to the internet. I read the instructions in the support screen about …
Technology self-tutoring: the tutor checks the importance of unplugging an unused phone charger. I’ve read in more than one place to unplug a phone charger when it’s not being used. Doing so I find inconvenient, but I’ve done it anyway …
Mobile phones, electronics: should I unplug the phone charger when not in use? 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 »