Advertisements
Advertisements
प्रश्न
A heating element is marked 210 V, 630 W. Find the resistance of the element when connected to a 210 V dc source.
Advertisements
उत्तर
∵ Power is given as, `P= V^2/R,∴R = V^2/P = 210^2/630 = 70Ω`
APPEARS IN
संबंधित प्रश्न
A heating element is marked 210 V, 630 W. What is the value of the current drawn by the element when connected to a 210 V dc source?
Two wires of equal length, one of copper and the other of manganin have the same resistance. Which wire is thicker?
Plot a graph showing the variation of stopping potential with the frequency of incident radiation for two different photosensitive materials having work functions W1 and W2 (W1 > W2). On what factors does the (i) slope and (ii) intercept of the lines depend?
A wire of length 1 m and radius 0.1 mm has a resistance of 100 Ω. Find the resistivity of the material.
A uniform wire of resistance 100 Ω is melted and recast as a wire whose length is double that of the original. What would be the resistance of the wire?
What length of a copper wire of cross-sectional area 0.01 mm2 will be needed to prepare a resistance of 1 kΩ? Resistivity of copper = 1.7 × 10–8 Ωm
The electrochemical equivalent of a material depends on _______________ .
If R1 and R2 are filament resistances of a 200 W and a 100 W bulb respectively, designed to operate on the same voltage, then:
Choose the correct alternative:
The resistivity of the alloy manganin is nearly independent of/increases rapidly with increase of temperature.
Fuse wire should have
