Physics
The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 127.5 V ?
8.5 A
24 A
10:00 AM
12:00 AM
8.5 A
V = 60V and I = 4A_x000D_
R = V/I_x000D_
โ= 60/4_x000D_
โ=15ฮฉ_x000D_
When potential difference is increased to 127.5 V_x000D_
I = V/R_x000D_
โ= 127.5/15_x000D_
โ= 8.5 A_x000D_
The current through the heater becomes 8.5 A.
Related posts
Radian is used to measureA. Temperature
B. Intensity of Flame
C. Angle
D. Solid Angle
Flemings ”Left hand Rule” is associated with the effect of
A. Electric field on current
B. Magnetic field on magnet
C. Electric field on magnet
D. Magnetic Field on current
The sky appears blue due to
A. Rayleigh scattering
B. Mie scattering
C. Back scattering
D. None of the above
Vehicles use ________ to see the objects coming from behind.
A. Concave lens
B. Convex lens
C. Convex mirror
D. Concave mirror
Which elements are malleable and good conductors of electricity?
A. Tin and silver
B. Iodine and silver
C. Tin and xenon
D. Iodine and xenon
The colour of the ocean appears to be blue because the sunlight falling on it is
A. Reflected
B. Refracted
C. Diffracted
D. Scattered
Mach number is used in connection with the speed of
A. sound
B. aircraft
C. spacecraft
D. ships
Leave a Reply