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Fundamentals

Using a Multimeter

This article introduces the basic concepts of multimeters and explains how to use them for basic measurements. Multimeters are one of the most useful electrical and electronic aids available to us. Effectively they are...

The Dreaded Ohms Law

In a previous article we looked at the power formula, and discussed the relationship between power, voltage and current. Having looked at the power formula, there is now only one more formula needed to...

What is Electrical Power?

What is electrical power? What is the formula for electrical power? What is watts, volts and amps? This article introduces and illustrates these electrical basics and in particular the power formula. As this is...

AC and DC

This article looks at some basic concepts and misconceptions of AC and DC electrical circuits. There are no formulas involved, just explanations to some commonly asked questions like:What is AC and DC? What are...

Reader's Feedback

Linda H

Your clear and non-technical explanations were life saving to an almost-80 grandma! Thanks!

Linda H

USA

Geoff the Grey Geek

2020-11-16T06:36:45+10:00

Linda H

USA

Your clear and non-technical explanations were life saving to an almost-80 grandma! Thanks!

https://geoffthegreygeek.com/testimonials/linda-h/

Marc

Hi Geoff!!
WOW, what a wealth of knowledge you are! Thank you for sharing your expertise! and THANK YOU for making this project a huge success!! I couldn't be more pleased with the sound and I am REALLY happy knowing that it is wired safely!!

Marc, USA

Geoff the Grey Geek

2015-01-12T08:53:41+10:00

Marc, USA

Hi Geoff!! WOW, what a wealth of knowledge you are! Thank you for sharing your expertise! and THANK YOU for making this project a huge success!! I couldn't be more pleased with the sound and I am REALLY happy knowing that it is wired safely!!

https://geoffthegreygeek.com/testimonials/marc/

Matt Bunnell (Indianapolis)

Thank You Geoff!
This article demystified microphone sensitivity for me in a big way and helped me understand the concept much better.

Matt B,

Indianapolis

Geoff the Grey Geek

2014-12-02T13:11:40+10:00

Matt B,

Indianapolis

Thank You Geoff! This article demystified microphone sensitivity for me in a big way and helped me understand the concept much better.

https://geoffthegreygeek.com/testimonials/matt-bunnell-indianapolis/

Arnita

Thank you very much for your help.
I wonder why the manufacturers don't tell you this in the manual. My mom said to thank you also, she said now she won't have to pull out her hair. Keep up the good work, this is a great site.

Arnita C,

Baltimore, Maryland, USA

Geoff the Grey Geek

2014-11-11T20:38:55+10:00

Arnita C,

Baltimore, Maryland, USA

Thank you very much for your help. I wonder why the manufacturers don't tell you this in the manual. My mom said to thank you also, she said now she won't have to pull out her hair. Keep up the good work, this is a great site.

https://geoffthegreygeek.com/testimonials/arnita/

Bob Johnson

Geoff, you have been a GOD SEND with your technical advice!
Our church congregation THANKS you!
Grace and Peace.

Bob J,

Bruce WI, USA

Geoff the Grey Geek

2014-11-11T20:21:29+10:00

Bob J,

Bruce WI, USA

Geoff, you have been a GOD SEND with your technical advice! Our church congregation THANKS you! Grace and Peace.

https://geoffthegreygeek.com/testimonials/bob-johnson/

Avril

Thanks for your help - the husband had it plugged into the wrong socket!

Name withheld

Geoff the Grey Geek

2014-11-11T20:02:57+10:00

Name withheld

Thanks for your help - the husband had it plugged into the wrong socket!

https://geoffthegreygeek.com/testimonials/avril/

Carole

Thank you so much for your reply!
I can't thank you enough for getting back to me - it's really kind of you - I have asked so many people and sent emails and had no replies from anyone except you!!

Carole M, UK

Geoff the Grey Geek

2014-11-11T19:57:58+10:00

Carole M, UK

Thank you so much for your reply! I can't thank you enough for getting back to me - it's really kind of you - I have asked so many people and sent emails and had no replies from anyone except you!!

https://geoffthegreygeek.com/testimonials/carole/

Paula

Thank you for your advice. I truly appreciate your website and your help.

Paula,

Lockport, NY, USA

Geoff the Grey Geek

2014-11-11T19:51:50+10:00

Paula,

Lockport, NY, USA

Thank you for your advice. I truly appreciate your website and your help.

https://geoffthegreygeek.com/testimonials/paula/

Chris R

Thank you so much Geoff for all your patience and support, it is very very much appreciated.
Kind regards,

Chris R,

London, UK

Geoff the Grey Geek

2014-11-11T19:40:44+10:00

Chris R,

London, UK

Thank you so much Geoff for all your patience and support, it is very very much appreciated. Kind regards,

https://geoffthegreygeek.com/testimonials/3715/

Kim

Thank you SO much Geoff!
(...and thank you on behalf of the students who will be able to hear me in the future!)

Kim,

Los Angeles, CA, USA

Geoff the Grey Geek

2014-11-11T19:35:09+10:00

Kim,

Los Angeles, CA, USA

Thank you SO much Geoff! (...and thank you on behalf of the students who will be able to hear me in the future!)

https://geoffthegreygeek.com/testimonials/3714/

Geoff the Grey Geek