1. Let's say that the charge is a proton. If the potential difference between the charged plates is 6.0 volts, then how much potential energy does the proton lose as it accelerated from the positive plate to the negative plate? Lo
1. Let's say that the charge is a proton. If the potential difference between the charged plates is 6.0 volts, then how much potential energy does the proton lose as it accelerated from the positive plate to the negative plate? Lo
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Transcribed Image Text:Electric Potential Energy and Electric Potential: for this activity, you need a multimeter, a D-cell
battery, wires, 2 light bulbs and 2 light bulb holders. I'Il let you figure out how many wires you
need - that's part of the fun. Do #1, #2 before you gather materials.
The quantity "electric potential' is really a ratio. It is the change of the electrical potential
energy of a charge divided by that same charge. It is symbolized by the letter "V" and its unit is
the Volt' which is equal to a Joule per Coulomb. While a deep understanding of potential may
require one more physics classes, for Experiments it may suffice to say that potential is
something that forces a charge to either speed up or slow down.
1. Let's say that the charge is a proton. If the potential difference between the charged plates
is 6.0 volts, then how much potential energy does the proton lose as it accelerated from the
positive plate to the negative plate?
2. Instead of a proton, imagine at a Cu* ion were placed at the positive plate. How much
potential energy would the copper ion lose as it crossed the gap between the plates? How
much kinetic energy would it gain?
3. Now let's try measuring potential. Ask your teacher to show you how to measure electric
potential, and use the multimeter to measure the potential difference between the two ends of
a battery.
4. Now set things up so that one lightbulb will light up. Measure the potential drop across the
lightbulb in volts. Write your answer here:
5. What do you notice about the potential across the battery and the lightbulb? Can you
explain this in terms of conservation of energy? (ie think of a charge flowing around the
circuit. where does the charge gain potential energy? Does this potential energy get converted
into something else?
6. Now set things up so that two lightbulbs light up. Measure the potential drop, in volts,
across both lightbulbs. Compare that to the battery potential, in volts.
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