These are all from the Joule Heat lab/experiment in physics II 1. Why should the
ID: 2262568 • Letter: T
Question
These are all from the Joule Heat lab/experiment in physics II
1. Why should the initial temperature of the water be several degrees below room temperature?
2. Why is it nexessary to make adjustments to maintain a constant current in the ciruit?
3. (a.) Circular metal wires in electrical circuits may have different cross-sectional areas(different diameters) and different lengths. For a given applied voltage, how would the joule heat vary with these parameters?
(b) Would the wire material make a difference? (hint: see resistivity in textbook)
4. Do heating applications such as hair dryers and toasters have high-resistance or low- resistance elements? explain please.
Explanation / Answer
1)to find the tmeperature of water more accurately.
2) P = i^2*R
E = p*t
when i is constant we can find energy dissipated easily
3)
a)Resistance, R = rho*L/A
p = i^2*R
as we change L and A, R chages.
as A or L varies, R varies and p also varies.
b) yes.
4) high resistance.
Because P = i^2*R
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