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Answers
Question :
Why does the cord of an electric heater not glow while the heating element does?
Answer :
The heating element of an electric heater ismade up of an alloy that has a very high resistance. So, when current flows through this element, it becomes too hot and glows red. Whereas, the cord is made up of copper or aluminum whose resistance is low. Hence, the cord of an electric heater does not glow while the heating element does.
Question :
Compute the heat generated while transferring 96,000C of charge in one hour through a potential difference of 50V.
Answer :
Given :
- Charge [Q] = 96,000C
- Time [t] = 1hr/3600sec
- Potential difference [V] = 50V
Finding current [I] :
- Current [I] = Q/t
- I = 96000/3600
- I = 960/36
- I = 80/3A
Finding heat generated :
- Heat = VIt
- H = (50) (80/3) (3600)
- H = (50) (80) (1200)
- H = (4000) (1200)
- H = 4800000
- H = 4.8 × 10⁶ J
Heat generated is 4.8 × 10⁶J.
Question :
An electric iron of resistance 20Ω takes a current of 5A. Calculate the heat developed in 30s.
Answer :
Given :
- Resistance [R] = 20Ω
- Current [I] = 5A
- Time [t] = 30s
Finding heat developed in 30s :
- Heat = I²Rt
- H = (5)² (20) (30)
- H = (25) (600)
- H = 15000
- H = 1.5 × 10⁴ J
Heat developed in 30s is 1.5 × 10⁴J.
Question :
100J of heat is produced each second in a 4Ω resistance. Find the potential difference across the resistor.
Answer :
Given :
- Heat [H] = 100J
- Resistance [R] = 4Ω
- Time [t] = 1sec
Finding current [I] :
- Heat = I²Rt
- (100) = I² (4) (1)
- 100 = I² 4
- I = √100/4
- I = 10/2
- I = 5A
Finding voltage [V] :
- V = IR
- V = (5) (4)
- V = 20V
Potential difference across the resistor is 20V.
Answer:
The heating element of an electric heater ismade up of an alloy that has a very high resistance. So, when current flows through this element, it becomes too hot and glows red. Whereas, the cord is made up of copper or aluminum whose resistance is low. Hence, the cord of an electric heater does not glow while the heating element does.
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