I is correct ii is correct

1) Consider the circuits below and calculate:

1. The total resistance in the circuit

2. The current in the circuit

3. The voltage drop across each resistor

A)

1. RT = 20 + 19 + 20 = 59

2. VT = RT  * IT 

10 = 59 * IT    >   IT = 0.17A

3. V1  = R1  * I1   >   V1  = 20 * 0.17 = 3.4V

V2  = 19 * 0.17 = 3.23V

V3  = 20 * 0.17 = 3.4V

B) 

1. RT = 12 + 5 + 10 = 27

2. VT = RT  * IT 

3 = 27 * IT    >   IT = 0.11A

3. V1  = R1  * I1   >   V1  = 12 * 0.11 = 1.32V

V2  = 5 * 0.11 = 0.55V

V3  = 10 * 0.11 = 1.1V

2) Consider the diagram below and determine:

1. the total equivalent resistance

2. the voltage drops across R1, R2, and R3

3. the resistance in R2

1. VT = RT  * IT 

15 = RT  * 0.05    >  RT = 300

2. V1  = R1  * I1   >   V1  = 5 * 0.05 = 0.25V

V3 = 15 * 0.05 = 0.75V

VT = 0.25 + V2 + 0.75     >     15 = 1 + V2         >     V2 = 14V

3. RT = 5 +  R2 + 15    >   300 = 20 +R2     >     R2  = 280

3) What is the difference between the independent variable and dependent variable in an investigation?

     The independent variable is the one you choose to vary.

     The dependent variable is the one you keep track of as the independent keeps being changed.

4) How many trials, at least, must be run for each variation in an investigation?

     Three.

5) How many variations, at least, must be run in an investigation?

      Five.

6) List the subtopics of a lab report in the correct sequence.

     Title/Purpose/Background Information/Materials/Methods/Data

Collection/Analysis/Conclusion.