Precaution In Experiment 1e455m

EXPERIMENT

MEASURING INSTRUMENT

SPRING / HOOKE’S LAW

PRECAUTION THAT CAN BE TAKEN a. Avoid parallax error by placing the eye perpendicular to the scale. (ammeter, volmeter, measuring cylinder, ruler) b. Take into zero error of instrument. (caliper, micrometer) a. Make sure the spring is not loaded beyond the elastic limit. (the spring return to original position when the load is taken of b. Avoid parallax error by placing the eye perpendicular to the scale. a. Liquid must be stirred constantly so that temperature rises evenly. b. Alluminium block must be wrapped with insulating material to prevent heat lost.

HEAT

c. Thermometer bulb should be smeared with oil to give better thermal with the block. d. Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale of the thermometer. a. Experiment must be carried out in dark room.

LIGHT

b. Lens, screen and object must be in line c. Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale of the ruler. a. All connections of wire & other device must be tight.

ELECTRICITY

b. Of the switch after readings are taken to prevent wires from heating up (resistance increase) c. Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale of the ammeter/ voltmeter.