1. When the electrical energy in joules is completely converted to heat in calor
ID: 1517679 • Letter: 1
Question
1. When the electrical energy in joules is completely converted to heat in calories,
(a) what is the ratio between these two?
what is the designed name for this ratio?
2. An ammeter is a device to measure the electrical current in a circuit. A voltmeter is a device to measure the electrical potential difference between two points in a circuit. What are units for electrical current and electrical potential?
3. Explain the difference between heat capacity and specific heat.
4. If the electric current passing a heater is 3.0 A, the voltage cross the heater is 10.0V, and the heater is turned on for 15 minutes, calculate
(a) the dissipating power and
(b) the energy consumed by the heater.
Explanation / Answer
(1)
1 Joule = 0.239 Calorie
Ratio = 0.239
(2)
Unit of Current is Ampere denoted by A !!
Unit of Potential is Volt, denoted by V.
(3)
Heat capacity:- It is the amount of heat required to change the temp of a substance by 1 oC.
Specific heat capacity :- It is the amount of heat required to change the temp of a unit mass (1 kg or 1 gm ) of a substance by 1 oC.
(4)
I = 3.0 A
V = 10.0 V
t = 15 min = 15*60 = 900 s
(a)
Power , P = V*I
P = 10.0*3.0 W
P = 30 W
(b)
Energy = Power * time
E = 30 * 900 J
E = 27000 J
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