Physics Laboratory 202/212 Basic Electric Quantities Experiment 2 Questions: 1.
ID: 2075763 • Letter: P
Question
Physics Laboratory 202/212 Basic Electric Quantities Experiment 2 Questions: 1. Does your graph verify ohm's Law? Why or why not? roe due percent ercr iz fairly small 2. Do the data from Table (b) verify how resistors in series add? Explain any discrepancies between the total resistances. 3. Do the data from Table (c) verify how resistons in parallel add? Explain discrepancies between the total resistances. Which the following circuits may be used to determine the value of the resistor? Circle that apply. 5. Knowing that the ammeter must be connected in series with the circuit and the voltmeter must be connected in parallel, what does this tells you about the internal resistance of each device?Explanation / Answer
2) Yes, Resistance in series can be calculated as arithematic sum of resistors. The discrepancies are due to the tolerance % of each resistor hence the calculated value of resistance should be a range of numbers and the measured value of resitance falls in this range.
3) Yes, Resistance in parallel can be calculated as reciprocal sum of resistors. The discrepancies are due to contact resistance of electrical leads and connections. Other sources of errors include the degree of efficiency of resistors and random error
4) 1st circuit is correct configuration since voltage is measured across two points and current is measured in its the direction of flow
5) An ideal Voltmeter has infinite resistance , a real voltmeter would have very high resistance to ensure that its connection doesnot alter the flow of current in the circuit. If its connected in series, it would hinder the current flow due to very high resistance. Therefore it is connected in parallel to the load to calculate potential difference across two points.
An ideal ammeter has zero impedence, a real ammeter would have very low resistance to ensure unhindered current flow through the wire for measuring accurate ammeter reading.