Question

List all the formula's of electricity chapter class 10.

Answer 1

Answer:

✒ Current = I = Q / t

• Current = I.
• Q = Charge.
• t = time taken.

✒ Voltage =V = E / Q (or) V = W / Q

• V = W / QE = Energy.
• W = Work done.
• Voltage (V).

✒ Resistance = R = ρl / A

• Resistance = R.
• ρ = Resistivity.
• l = length
• A = Area

✒ Resistance = R = V / I

✒ Power = P = VI

✒ Conductivity = σ = 1 / ρ

Electricity Formulas are applied in calculating the unknown electrical parameters from the known in electric circuits.

Explanation:

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Answer 2

Answer:

Formulas Unit

Current I I = Q / t

Q = Charge

t = time taken

Amperes (A)

Voltage V V = E / Q

or

V = W / Q

E = Energy, W = Work done

Volts (V)

Resistance R R = ρl / A

ρ = Resistivity,

l = length,

A = Area

or,

R = V / I

Ohm (Ω)

Power P P = VI Watts (W)

Conductivity σ sigma = 1 / ρ Siemens per meter (S/m)

Electricity Formulas are applied in calculating the unknown electrical parameters from the known in electric circuits.

Solved Examples

Example 1

An electric heater has a potential difference of 220 V and resistance is 70 Ω. Determine the magnitude of the current flowing through it.

Solution:

Given:

Resistance R = 70 Ω

Voltage V = 220 V

The current formula is given by

I = V / R

= 220 / 70

I = 3.1428 A

Example 2

An electrical lamp lights for 4 hours and draws a current of 0.5 A. Calculate the amount of charge flowing through the lamp.

Solution:

Current I = 0.5 A

Time taken t = 4 hours

t= 4 × 3600 = 14400 s,

Charge Q = I × t

= 0.5 ×14400

Q= 7200 C