Phys Unit 9 -- Circuits

Question 1

What is a series circuit?

Answer 1

A circuit that has only one path for electrons to flow.

Question 2

What is a parallel circuit?

Answer 2

A circuit with more than one path.

Question 3

How does Voltage work in Series circuits?

Answer 3

They share the same load (VT = V1 + V2 …)

Question 4

True or False: the current is never the same in a series circuit.

Answer 4

False! In a series circuit, the current is always the same. (IT = I1 + I2 …)

Question 5

How does Voltage work in Parallel circuits?

Answer 5

Voltage in a parallel circuit is equal to the battery (VT = V1 = V2)

Question 6

What is the definition of current?

Answer 6

The flow of electrons

Question 7

What unit is Energy measured in? Give unit and letter.

Answer 7

Joules, J

Question 8

Define Electric Power:

Answer 8

Rate of which electric potential energy becomes a device is used or transformed.

Question 9

Give the unit for Power:

Answer 9

Watts, W

Question 10

State the formula for calculating Power and its two alternatives. (PET)

Answer 10

P = E/t
E = Pt
t = E/P

time is in seconds

Question 11

State the formula for calculating Power and its two alternatives. (Poison Ivy)

Answer 11

P = IV
I = P/V
V = P/I

Question 12

When doing a “Paying for electricity” problem, what are the units?

Answer 12

Power: kW
Energy: kWh
Time: t (in hours)

Question 13

Name the formula for cost

Answer 13

Cost = (enery in kWh) x (0.08/kWh)

0.08 is a changing value, it is NOT set in stone.