Question

Leave the knife switch open until your instructor has checked your circuit and given you permission to close it. The meters you are using are expensive and can easily be ruined by improper use. Close the switch and quickly read the meters. Have your partner record the readings as you read the meters alou. pen e swi c as soon as the readings are completed. Record your readings in Table 40-1. Calculate the value of the resistor in ohms. Enter this value in Table 40-1. Change the voltage to a higher value (6 or 8 volts) and once again read the meters. Record your readings. Calculate the resistance of Hi a second time. Record this value in Table 40-1. Starting with the lower voltage, make two measurements of the resistance of a second resistor. Repeat with a third resistor. Enter all values in Table 40-1. Data and Calculations State the relationship between the current flowing through a circuit and the voltage and resistance in the circuit. Describe the proper placement of a voltmeter in a circuit.
Please explain each one thoroughly

Answer 1

1)

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance,one arrives at the usual mathematical equation that describes this relationship:

$I = \frac{V}{R},$

The extension 1, question 2 and 3 answer can be found in the following picture

Voltage (volts) current meter in A series Current (Amps) Extension 1 voltmeter in parallel

If we graph V vs I the relation should be lineal and the slope is equal to teh resistance, any variation is due to the internal resistances of the current and volt meter. which are located as you can see on the right, the ahmeter is in series and the voltmeter must be in parallel