circuit formulas

Question 1

What is electric current

Answer 1

symbol = (I)
measured in (Amperes)
current is the measure of the flow of charge between 2 points

Question 2

What is Q and how do you work it out

Answer 2

charge (coulombs)
Work it out using the equation Q=I*t

Question 3

what is t

Answer 3

time (seconds)

Question 4

what is V

Answer 4

volts ( Measurement of electrical potential difference)

Question 5

what is R and Ω

Answer 5

R = resistance Ω = electrical resistance

Question 6

what is P

Answer 6

P is the electric power in watts (W)
P = the rate at which energy is transferred

Question 7

what is E

Answer 7

Energy measured in joules

Question 8

resistance equation

Answer 8

R = V / I

Question 9

volt equations

Answer 9

V = E / Q
V = P / I
V = I * R

Question 10

power equation

Answer 10

p = V * I
P = I squared * R
P = E/t

Question 11

how do you work out resistance when it’s in a parallel
arrangement?

Answer 11

1/Total R = 1/R + 1/R + 1/R
once you get you’re result you flip the answer and find out what it equals and that is the combined resistance

Question 12

How do you remember using the left hand rule the three directions and what are they?

Answer 12

Middlesbrough Football Club: movement, field and current.

Question 13

What happens if an electrical conductor is moved relative to a magnetic field.

Answer 13

A potential difference is induced across the ends of the conductor.

Question 14

What is the right-hand grip rule used for

Answer 14

The fingers Schofield Direction the thumb shows current direction.

Question 15

How does an electrical magnet work?

Answer 15

Current is switched on, this causes a magnetic field

Question 16

Solenoid produces a magnetic field, how can strength of the electromagnetic be increased?

Answer 16

By increasing the potential difference, increasing the current, adding more turns or adding a soft iron core

Question 17

How do you work out the magnetic flux density

Answer 17

F = B I L