18, 19, 20

Question 1

Equation for Current, Charge, and Time

Answer 1

Current (A) = Charge (C) / Time (s)

I = Q / t

Question 2

Equation for Potential Difference, Voltage, and Electromotive force (all the same)

Answer 2

voltage (V) = work done by charge (J) / charge (C)

V = W / Q

Question 3

Equation for resistance

Answer 3

Resistance (Ohms) = Voltage (V) / Current (A)

R = V / I

Question 4

Equation for power

Answer 4

Power (W) = Voltage (V) x Current (A)

P = V x I

Power (W) = Energy Transfer (J) / Time (s)

P = deltaE / t

Question 5

Equation for energy

Answer 5

E = VIt

Energy (J) = Voltage (V) x Current (A) x Time (s)

Question 6

energy transferred equation

Answer 6

energy transferred (kWh) = power (kW) x time (h)

Question 7

Relays

Answer 7

Help

Question 8

What is a diode?

Answer 8

A component that only allows current to flow one way in a circuit

Question 9

What is an LED

Answer 9

A light-emitting-diode

Question 10

Resistors in Series

Answer 10

R = R1 + R2

Question 11

Resistors in Parallel

Answer 11

1/R = 1/R1 + 1/R2

Question 12

Voltage in Series

Answer 12

V = V1 + V2

Question 13

What is a Potential Divider Circuit

Answer 13

Circuit with several resistance in series to obtain lower voltage.

Question 14

Two resistors used as potential divider

Answer 14

R1/R2 = V1/V2

Question 15

Relationship between resistance and their voltage in potential divider circuits

Answer 15

Proportional
i.e. Total Voltage = 27V
V1 = 9V
R1 = 27 Ohms
V2 = 18V
R2 = 54 Ohms
(I = A/3)

Question 16

Voltage in Parallel

Answer 16

V = V1 = V2

Question 17

Current in Series

Answer 17

I = I1= I2

Question 18

Current in Parallel

Answer 18

I = I1 + I2