Pre-Lab Activity: Ohm\'s Law In the first activity you will graphically determin

Question

Pre-Lab Activity: Ohm's Law In the first activity you will graphically determine the resistance of an ohmic resistor. If an object is "ohmic," that means its resistance should remain constant over a wide range of voltages being applied to it and currents flowing through it and will follow Ohm's Law, AV - IR Question 1: If we want to measure the current in a resistor with a current probe at the same time that you measure the voltage difference across the resistor how should the current probe and multimeter be connected with the resistor? (1/2 pt) Should the current probe be in series or parallel with the resistor? a. i. Series ii. Parallel (1/2 pt) Should the multimeter that measures the voltage difference be in series or in parallel with the resistor? b. i. Series ii. Parallel Question 2: During this lab you will you adjust the voltage level on the power supply and use the current probe to measure the current in a circuit. We want to use this data to graphically determine the resistance of your circuit using Ohm's law. (1 pt) Write down the equation for Ohm's law from the Introduction. a. (1/2 pt) In the experiment described, what is the independent variable in equation for Ohm's law? b. c. (1/2 pt)What is the dependent variable in Ohm's law?

Explanation / Answer

1] a] The current probe should measure the current passing through the resistor and so it the current passing through the current probe should be equal to the current passing through the resistor. This can only happen when the current probe is connected in series with the resistor since the current remains constant in a series connection. [answer - i]

b] The voltage probe must measure the voltage developed ACROSS the resistor and since we know that the voltage remains the same in a parallel circuit, connecting the voltage probe parallel to the resistor would ensure that the voltage developed at the resistor is equal to the voltage at the voltage probe. [answer - ii]

2]

Equation for Ohm's law is:

V = IR

here, R is the constant of proportionality which will be determined by studying variations in V and I.

Here, voltage is adjusted. So, the independent variable is Voltage V and dependent variable is current I.

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.