lab test 1

Question 1

in series, what is always =?

Answer 1

current (I)

Question 2

in parallel, what is always =?

Answer 2

voltage (V)

Question 3

how do you calculate the voltage in series?

Answer 3

V of each resistor are added to give V total

Question 4

how do you calculate the current in parallel?

Answer 4

I after each resistor are added to give I total

Question 5

how do you measure current ?

Answer 5

by putting the machine in series with the circuit (deplug something to put machine)

Question 6

how do you measure voltage?

Answer 6

by putting the machine in parallel with the circuit (red wire before resistor and black after)

Question 7

what is Ohm’s law?

Answer 7

V=RI

Question 8

what is the unit of resistance?

Answer 8

ohms

Question 9

what is the formula to find R equivalent in series?

Answer 9

Req = R1+R2+R3+…

Question 10

what is the formula to find R equivalent in parallel?

Answer 10

Req = (1/R1 + 1/R2 + 1/R3 + …) ^-1

Question 11

what is the current rule?

Answer 11

the currents entering a junctions added up = the current leaving the junction

Question 12

what is the loop rule?

Answer 12

the sum of potention differences (delta V) = 0

Question 13

what formula will give you the I of the circuit?

Answer 13

delta Vbatt = Req x I

Question 14

what is the first step of the second technique to find theoretical values?

Answer 14

choose a direction for current for each branch and label uniquely

Question 15

what is the second step of the second technique to find theoretical values?

Answer 15

choose the direction of each loop (closed path in circuit): easier to choose same direction as current

Question 16

what should be the sum of the voltages around a loop?

Answer 16

0

Question 17

what is the third step of the second technique to find theoretical values?

Answer 17

create the equations for each loop (all the V added = 0 and replace V for ohm’s law)
create the equation of current for the circuit (current rule)

Question 18

what is the last step of the second technique to find theoretical values?

Answer 18

isolate variables in each equation to create one with only one unknown. isolate this unknown and use other equations to find out other unknowns. Use Ohms law for other unknowns.