Formulas

Question 1

What is the “Ohm’s Law”?

Answer 1

Voltage = Current x Resistance
V = I x R

Question 2

How to figure out the resistance?

Answer 2

Resistance = Voltage / Current
R = V/I

Question 3

How to figure out Current?

Answer 3

Current = Voltage / Resistance
I = V/R

Question 4

Rule of the Ohm’s Law

Answer 4

In the triangle the Voltage (V) is going to remain above the Current (I) and resistance (R)

Question 5

What’s the formula for Resistance in a PARALLEL circuit?

Answer 5

1/Rt = 1/R1 + 1/R2 + 1/R3 +…

Question 6

What’s the formula for Resistance in a SERIES circuit?

Answer 6

Rt = R1 + R2 +R3

Question 7

What’s the formula for Voltage in a PARALLEL circuit?

Answer 7

Vt = V1 = V2 = Vn

Question 8

What’s the formula for Voltage in a SERIES circuit?

Answer 8

VT = V1 + V2 + … + VN

Question 9

What’s the formula for Current in a PARALLEL circuit?

Answer 9

IT = I1 + I2 + … + IN

Question 10

What’s the formula for Current in a SERIES circuit?

Answer 10

IT = I1 = I2 = IN

Question 11

What is equation for energy?

Answer 11

Energy = Power x Time
E = P x T

Question 12

What is the equation for power?

Answer 12

Power = Voltage x Current
P = V x I

Question 13

What are the units for Power?

Answer 13

Watts (W) or Kilowatts (kW)

Question 14

What is the unit for energy?

Answer 14

Joules (J) or kiloJoules (kJ)

Question 15

Energy - What does 1kJ equal?

Answer 15

1,000 J

Question 16

Power - What does 1kW equal?

Answer 16

1,000 W

Question 17

Formula for calculating cost

Answer 17

Cost = Energy Used x Rate

Question 18

Formula for Energy Efficiency

Answer 18

energy efficiency = (energy output / energy input) × 100

Question 19

What are the units for energy?

Answer 19

kwh