Section 2: Sensing

Question 1

Define Current

Answer 1

Current is the rate of movement (or flow) of charge, usually transferred via electrons in a circuit.
measured in Amps (C/s)

I=Q/t

Question 2

Define potential difference

Answer 2

Potential difference is the energy converted per unit of charge moved, measured in volts.
V=J/C

P.d = Delta energy/ charge
V=W/Q

Question 3

Define resistance

Answer 3

Resistance is a measure of how difficult it is for current to flow, measured in ohms
R=V/I

Question 4

Define Conductance

Answer 4

Conductance is a measure of how easy it is for current to flow, the reciprocal of resistance, measured in siemens S
G=I/V