Activity B: Resistance (2) Make connections on Electronics Board between Battery

Question

Activity B: Resistance (2) Make connections on Electronics Board between Battery Switch and 3 Resistor using Orange and Grey wires as shown (3) Connect Voltage Sensor's Red and Black plugs at each end of Resistor as shown (4) Plug in Current Sensor' s Red and Black cables as shown Measurement of Resistance otential meter Resistance of a Resistor can be determined by simultaneously measuring potential drop Circuit is now complete 3 across it and current flowing through it. To do this we will create circuit depicted opposite. A switch is included in circuit to minimize use of Battery (5) Depress Switch, keep it depressed. Click Start. After 1 s click Current Stop, release Switch meter Potential drop across Resistor and current flowing though it will appear below. Throughout this experiment 3 Resistors will be used. Their values are 3 . 5 6 , 10 . Potential Drop (V) Current (A) across Resistor flowing through Resistor Potential Current (1) Plug ends of Red and Black 24" cables into Red and Black Current Sensor's connectors respectively Resistor 5.6 10 Measured Resistances (Q) (6) Record values oppposite. (7) Repeat (2) to (6) for 56 Resistor | (8) Repeat (2) to (6) for 10 Resistor VoltagCurtent (9) Use measured potential and Cable current values and equation V I-R to determine actual resistances of Resistors 5.6 Sensor Cable 10 Sensor Cah For accuracy reasons, we will use measured resistance values rather than nominal ones in the calculations in this experiment. Delete ALL Data runs, save work and then proceed to next page 4

Explanation / Answer

Assuming when the switch closes, the current starts flowing. As per ohm's law,

V = I*R but we do have internal resistance also

therefore, V = I*(R+r)

I = V / R + r

I = 10 / 3 + 1.5

I = 2.222 amps.

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