Question

1) (lab manual, Ch. 22.5) State Ohm's law in words. a. (lab manual, Equation 22.8) Write the corresponding equation for Ohm's law. Define all variables. What are the SI units of each variable? b. (Example 22.5) If a potential difference of 3.0 V and a current of 0.10 A is measured in the circuit, what is the measured resistance value of the resistor? Include all units. c. (lab manual, Ch. 22.5) How can resistance be determined for an ohmic device from a plot of voltage versus current (note AV = R 1)? 2) (Ch. 22.5) What is the resistance of an ideal wire? 3) (Ch. 23.4, Figure 23.24) Do ammeters have very large (>>R) or very small <<R) resistances? Sketch a simple battery and resistor circuit with an ammeter in series to make measurements. 4) (Ch. 23.4, Figure 23.25) Do voltmeters have very large (>>R) or very small (<<R) resistances? Sketch a simple battery and resistor circuit with a voltmeter in parallel to make measurements.

Answer 1

Solution)(1) Ohms Law : it states that the current produced in a circuit is directly proportional to voltage applied.

(a) V = iR

Here V is Voltage

i is current

R is Resistance

SI units are

For voltage SI units are volts

For current SI units are Amperes

For Resistance SI units are Ohms

(b) V = 3 V

i = 0.10 A

R = ?

V = iR

R = (V/i)

R = (3)/(0.10)

R = 30 ohms

(c) The slope of voltage vs current graph gives Resistance .

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