Re: [Phys-l] glassware needed

[ludwik kowalski <kowalskil@mail.montclair.edu>]

On Jan 1, 2009, at 8:08 PM, Brian Whatcott wrote:

> At 06:38 PM 1/1/2009, Ludwik, you wrote:
>
> > I would use a d.c. power supply (measuring I and U and
> > calculating the input energy as U*I*t).
>
> Would the I and V readings be taken with an analog meter (+-5%)
>  or an inexpensive DVM (+-1 count and <1% often)
> and an inexpensive DC power supply ( ripple +- 3%), I wonder, Ludwik?
> :-)

That depends on the acceptable accuracy (systematic error) and  
precision (random error).

Ludwik Kowalski, a retired physics teacher
5 Horizon Road, Apt. 2702, Fort Lee, NJ, 07024, USA
Also an amateur journalist at http://csam.montclair.edu/~kowalski/cf/