I just bought a cordless electric toothbrush. What intrigues me is there appears to be no metal contacts on the charging base. Can anyone explain?
There are two coils in the unit. One coil is in the charging base and the other is on the bottom of the toothbrush. Each charger coil generates a current and creates a magnetic field that's vital to the unit's operation. Lmao. I hope that helps.
I still remember the day when I put a sheet of kitchen roll over the new induction hob, then put the pan on top to fry the sausages. It was a good way of catching the fat splatters, but Jane was scratching her head with one hand and holding a fire extinguisher in the other.
One of my funniest memories goes back to my school days shortly after WW2, when one of our teachers was recalling his wartime experiences. Being regarded as one of the countries leading experts in RF and radar, he was given the task of designing and commissioning the defence system all along the south coast of England, which consisted of a large number of trapped dipole aerials tuned to fundamental and first harmonic frequencies. Drawn between steel towers all along the coast that suffered from gale force winds. Along with lack or hard drawn cable that had been drawn to the end of it's first modulus of elasticity, tuning the system up to 200 feet above the cliffs in sub zero temperatures was becoming a nightmare, particularly since since he only had a few experienced staff. At the same time whole regiments were arriving from the US in preparation for the landings in France. The MOD gave him a group of 50 young volunteers who had experience working at heights. He only had a few days to train them, which included not carrying anything metallic or wearing rings or other jewellery while tuning the trap span to multiples of the wavelengths, during commissioning with the power on. Everything was going fine, until all hell broke loose. No one had noticed that the guys denim overalls had copper rivets and buttons, that were starting to literally get red hot. A couple of the guys ended up at the top of the towers in sub zero temperatures and force 5 winds, wearing just their underwear.
Electromagnetism is a trip. The human body is made up of around 7 Octillion electromagnets. Scientists call them particles and depict them as little balls for some deceitful reason.
