Physics LabOhn\'s Law & DC Cireuits rev 4.0 Begin by bu have the voltmeter ildin
ID: 2304779 • Letter: P
Question
Physics LabOhn's Law & DC Cireuits rev 4.0 Begin by bu have the voltmeter ilding Circuit 1 with a battery and one of the smaller narrow t clamp off to the side ready to take measurements current bulbs. Always Cirsult alt (mV) ?, a) Predict how the voltage of the battery, Vbat, compares to the voltage of the bulb, Vei. Predict how the current, Ix. just before the bulb compares to the current, ly, just after the bulb. b) Measure Vbser and V How are the voltages re c) Measure I and Ly. How are the currents related? Do bulbs use up current to produce light? If yes, how, if no, what does get "used up"? d) For the remainder of the lab we will always start with Circuit 1 and change it by adding either more bulbs or more batteries. We will investigate how currents and voltages change. Do bulbs get brighter? Dimmer? Stay the same? need them. NOTE : haye the voltmete 176Explanation / Answer
a] Here, since there is no resistance other than the resistance offered by the bulb, all of the voltage developed by the battery appears at the bulb.
Vbatt = VB1
also, the battery is connected in series with the bulb. So, the current throughout the circuit before the bulb (X) and after the bulb (Y) should be the same.
so, IX = IY
b] The two voltages should be equal provided no external resistance is added.
VB1 = IxR
Where R is the resistance offered by the bulb.
c] Ix = Iy and they will be same for any point in the given circuit.
d] No. The bulbs uses up Voltage to produce light. 'Using up' something means that quantity is zero later on. Using up current would imply that the current is zero after the bulb which is not since IX = IY.