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| PAGE: 94 | SET: Exercises | PROBLEM: 74 |
Voltage used by an electrical device is 
, where 
is the voltage in volts, 
is the power in watts, and 
is the resistance in ohms.
The function 
.
(a)
Find power consumption of the lamp.
Voltage
.
Resistance
.
Solve for .
Consider .
.
Substitute the values of 
and 
in above equation.
watts.
The power consumption of the lamp is 
watts.
(b)
Find the resistance of the DVD player.
Current 
.
Power 
watts.
Solve for .
Consider .
Substitute the values of 
and 
in above equation.
The resistance of the DVD player is 
.
(c)
Ohms law :
Ohms law states that the current through a conductor between two points is directly proportional to the potential difference across the two points.
Ohms law expresses voltage in terms of current and resistance. The two functions are 
and 
.
Solve for .
Consider .
Substitute 
in equation (1).
(a) The power consumption of the lamp is 
watts.
(b) The resistance of the DVD player is 
.
(c) 
.
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