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Electricity, class 10 science, extra questions by Physics Advocate | advguruji

Electricity - Extra questions

Q1. Find the heat generated in a wire of resistance 100Ω connected to a constant voltage supply of 80 volts for 15 seconds.

Q2. An electric iron of rating 200V, 4A is connected to a suitable 200V voltage source. If a fan with power consumption 100W is connected to the iron with an independent switch. Calculate -
(i) Current for the entire circuit.
(ii) Resistance of the entire circuit.

Q3. Find the resistivity of a wire with resistance 20Ω, length 2 m and having cross-sectional area 2.5 mm².

Q4. Which has more resistivity : a thin copper wire at 30°C or a thick copper wire at 30°C?

Q5. Which has more resistivity : a copper wire at 30°C or an aluminium wire at 30°C?

Q6. Which has more resistivity : a copper wire at 30°C or a copper wire at 42°C with same length and diameter?

Q7. Calculate the resistance of a wire with resistivity 2 × 10-⁶ Ωm, length 5 m and diameter 2 mm. Take, Ï€ = 3.14

Q8. In figure, find the ammeter and voltmeter readings.
Q9. How many 10 Ohms resistors are required to make an equivalent resistance of -
(i) 5 Ω
(ii) 1.25 Ω
(iii) 20 Ω
(iv) 15 Ω
(v) 25 Ω
(vi) 22.5 Ω
Comment down your thoughts :⁠-⁠)

by www.advguruji.blogspot.com
----------------------------------------
Answers

Ans1. 960 J
Ans2. (i) 4.5 A    (ii) 44.44 Ω
Ans3.  2.5 × 10-⁵ Ωm
Ans4. Both have same resistivity
Ans7. 3.18 Ω
Ans9. (i) 2   (ii) 8   (iii) 2
(iv) 3   (v) 4   (vi) 6
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