Electricity, class 10 science, extra questions by Physics Advocate

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 200Ω, 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, π = 3.14

Q8. 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

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Answers

Ans1. 960 J

Ans2. (i) 4.5 A (ii) 44.44 Ω

Ans3. 2.5 × 10-⁴ Ωm

Ans4. Both have same resistivity

Ans7. 3.18 Ω

Ans8. (i) 2 (ii) 8 (iii) 2

(iv) 3 (v) 4 (vi) 6

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