Equations

Question 1

Resistance

Answer 1

R=PL/A

P = resistivity of conductor
L = length in meters
A= CSA

csa = 10 -6

answer in ohm meters

Question 2

Ohms law

Answer 2

V = I x R
I = V/R
R = V/I

volts (v) amps (i) ohms (r)

Question 3

Power

Answer 3

P = I x V

watts (p), amps (i), volts (v)

v = IxR therefore P = I x I x R

Question 4

Acceleration

Answer 4

V - U/
time

v = final velocity, u= initial velocity, t= time

ans = m/s

Question 5

Force (newton)

Answer 5

force = mass (kg) x acceleration (gravity)

gravity = 9.81 newton

Question 6

Work done

Answer 6

force x distance

force = mass x acc (gravity)

Question 7

mass (kg)

Answer 7

weight / gravity

gravity = 9.81 newton

Question 8

weight (newton)

Answer 8

mass (kg) x gravity (9.81 n)

Question 9

Rate of doing work (power)

Answer 9

1 kwh

1000 watts x 3600 seconds = 3,600,000 jules

Question 10

Average Power (Watts)

Answer 10

work done/time taken

work done = force (mass x gravity) x distance

Question 11

Efficency (%)

Answer 11

output power/ input power x 100%

Question 12

distance covered

Answer 12

weight (kg)/work done (nm)

work done = force (mass x gravity) x distance

Question 13

Opposing force (newton)

Answer 13

Distance / Work done

work done = force (mass x gravity 9.81) x distance

Question 14

Effort

Answer 14

load x load to fulcrum (distance) / effort to fulcrum (distance)