Answer:
4 volts
Explanation:
The diagram to the question is attached below.
Given that:
the battery voltage is = 12 volts
and the lights bulbs are identical; we can see that there are 3 light bulbs shown in the diagram below:
We can also see that the circuits are connected in series: if one light bulb happens to be removed from the circuit, the remaining light bulb will go out.
Thus; the voltage on each bulb since they are identical = V/3
= 12/3
= 4 volts
Explanation:
It is given that,
Work done, W = 240 J
Heat removed, Q = 610 J
(a) The refrigerator's coefficient of performance is given by :
COF = 2.54
(b) Let Q' is the heat per cycle is exhausted to the kitchen. It is given by :
Q' = Q + W
Q' = 610 + 240
Q' = 850 J
Hence, this is the required solution.
Answer:
35.7 mA
Explanation:
The magnetic field inside a solenoid is given by:
(1)
where
is the vacuum permeability
I is the current
n is the number of turns per unit length
Since we have
N = 870 turns
L = 0.390 (length of the solenoid)
we can calculate n
And now we can re-arrange eq.(1) to find the current, I: