practical circuits

Question 1

internal resistance

Answer 1

the internal resistance of a source of e.m.f is the resistance inherent in the source itself; some energy is transferred into other forms as work is done in driving charge through the resource itself

Question 2

terminal p.d

Answer 2

the potential difference across the terminal s of a source and is dependent on the current that is taken from the source

Question 3

potential divider

Answer 3

a circuit that splits the potential difference from a source into two parts. so that the p.d. across one section in V1 and the p.d across the other section is V2 where V1 + V2 = V

Question 4

sensor or transducer

Answer 4

an electronic component with a property that changes when a physical quantity such as temperature or light intensity alters

Question 5

potentiometer

Answer 5

a device used for comparing potential differences

Question 6

galvanometer

Answer 6

an instrument used to measure or detect small electric currents. It is often not calibrated. By adding resistors in series or in parallel with it, and with suitable calibration, it can act as a voltmeter or an ammeter, respectively

Question 7

null method

Answer 7

an experimental technique where a zero reading is sought. The word ‘null’ comes from the Latin ‘nullus’ meaning ‘not any more’ or nothing