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عرض 1771–1785 من أصل 2204 نتائج
Resistance Substitution Box
Set of 12 preferred value carbon resistors with rotary selection switch, in box. Values are 33 ohm, 7 W; 100 ohm, 7 W; 330 ohm, 4 W; l K ohm 1W; 3.3 K ohm 0.5W; 10 K ohm, 0.25 W; 33 K ohm, 0.25 W; 100 K ohm, 0.25 W; 330 K ohm, 0.25 W; 1 M ohm, 0.25 W; 3.3 M ohm, 0.25 W and 10 M ohm, 0.25 W.
SKU: PH50430Resistance Substitution Box
Resistance Substitution Box is a convenient instrument for determining the desired resistance values in circuits under design or test. This resistance substitution box has 12 different values 100 ? , 220 ? , 470 ? , 1 k? , 2 k? , 4 k? , 10 k? , 22 k? , 47 k? , 100 k? , 220 k? and 470 k? . All resistors are precision 1% resistors and are of 1 watt rating. Selected resistor can be attached in any circuit with 4 mm two red safety sockets.
SKU: PH50430NResistor Set
Consisting of six resisters of resistances with different current ratings. The resistors can be used in either the series or parallel mode. The resistors can be connected to any of the desired circuits through the safety sockets provided on the top of the kit for each resistor separately. Accuracy ± 5% . The specifications of each resistor are printed on the top panel of the kit. Mounted in moulded box.
SKU: PH50437Resonance Apparatus
Investigate the length, frequency and velocity of sound waves by studying the resonance of air columns. In the experiment, described below, you will use the wave equation (v = ?f) to measure the speed (v) of sound; here (f) is the frequency and (?) is the wavelength. A vibrating tuning fork, held over the top of the graduated water cylinder, will begin to resonate with the air column above the water in the cylinder. After taking the measurements of the air column and the tuning fork, the speed of sound can be calculated.
SKU: PH36178PRespirometer, Ganong’s
To measure gas evolved or absorbed by living materials or tissue extracts. A respirometer bulb with a small water reservoir at the bottom and hollow ground glass stopper at top in the neck with a hole which can be closed or opened by turning the stopper, a graduated burette opening out of the bulb which connects to a leveling tube via a rubber tubing. Respirometer chamber 50 mm dia, burette 180 x 20 mm graduated 0 to 25 ml and 100 to 75 ml, with special clamp for fixing to a 12 mm dia rod.
SKU: B13368
