Electricity

Question 1

Electric current

Answer 1

Flow of electrons

Question 2

Coulomb

Answer 2

Measurement of charge

Question 3

Q = Ne

Answer 3

Equation for overall charge on an object.
Q: charge
N: excess/deficit of electrons
e: charge of one electron

Question 4

I = Q/t

Answer 4

Equation for electric current.
I: amperes, current
Q: charge, coulombs
t: time, seconds

Question 5

Conventional current

Answer 5

Positive charge flow, positive to negative. False, but conventional

Question 6

Negative charge flow

Answer 6

Electrons move from negative terminal to positive. True, but not conventional

Question 7

Alternating current

Answer 7

Current periodically changes direction. Voltage also periodically reverses because of the changing direction of current

Question 8

Direct current

Answer 8

Current only flows in one direction. Most devices use DC, but AC is primarily used to transmit electricity over long distances. Needs to be converted.

Question 9

Electrical potential difference

Answer 9

Difference between two points

Question 10

V = E/Q

Answer 10

Equation for voltage
V: voltage, volts
E: energy, joules
Q: charge, coulombs

Question 11

Volt

Answer 11

One joule of work done by one coulomb of charge

Question 12

Resistance

Answer 12

Opposition to the flow of electrons

Question 13

R = V/I

Answer 13

Ohm’s law
R: resistance, ohms
V: voltage, volts
I: current, amperes

Question 14

Ohm

Answer 14

When one amp of current flows between one volt of potential difference

Question 15

Power

Answer 15

Work per second/rate of work

Question 16

Watt

Answer 16

Joules per second