Test Car Battery With a Multimeter

 

Connect the multimeter to the positive and negative battery terminals. If you don't have a voltage of around 12.6 volts, you may have a bad battery.  

Clinical thermometer

 

Tapping key

 

a light flexible metallic strip provided with contacts so that when it is momentarily pressed an electric circuit is made or broken and when it is released the opposite effect is automatically produced.

Van de Graaff generator

If we bring the grounding rod close enough to the large sphere, the electrons rip through the air molecules in order to jump onto the grounding rod, creating a spark and crackling noise.

DIY Test tube brushes

DIY test tube brushes using contantant wire S.W.G 22