All FORMULAS Of ELECTRICITY Class 10 in 60 Sec🔥| CBSE 10th Electricity Important Formulas #Cbse2024

Summary

This video quickly covers essential formulas in electricity, including charge, current, and electric potential. It explains Ohm's Law, resistance, and the differences between series and parallel resistance. The video also covers Joule's Law of heating and various formulas for power, including different expressions using voltage, current, and resistance. The video emphasizes how power formulas can be multiplied by time to calculate heat, making it a quick yet comprehensive guide to the fundamental electrical concepts.

Takeaways

• 😀 Charge is calculated as the number of electrons multiplied by the charge of an electron. The unit is Coulombs.
• 😀 Current is defined as charge divided by time. The unit of current is Amperes.
• 😀 Electric potential is the work done per charge. The unit is Volts.
• 😀 Ohm's Law states that voltage is equal to current multiplied by resistance.
• 😀 Resistance is calculated as resistivity multiplied by length and divided by the area. The unit is Ohms.
• 😀 Series resistance (RS) is the sum of individual resistances: RS = R1 + R2 + R3 and so on.
• 😀 Parallel resistance (RP) is calculated using the reciprocal formula: 1/RP = 1/R1 + 1/R2 + and so on.
• 😀 Joule's Law of Heating is represented by the formula H = I²RT, where H is heat, I is current, R is resistance, and T is time.
• 😀 Power can be calculated as work done divided by time, or as voltage multiplied by charge, or current squared multiplied by resistance.
• 😀 Another formula for power is voltage squared divided by resistance. These power formulas can be combined with time to calculate heat.

Q & A

What is the formula for calculating charge?

The formula for charge (Q) is Q = n × e, where 'n' is the number of electrons and 'e' is the charge of an electron. The unit of charge is Coulombs (C).

How is current calculated in electrical circuits?

Current (I) is calculated using the formula I = Q / t, where 'Q' is the charge and 't' is the time. The unit of current is Amperes (A).

What does electric potential (V) represent and how is it calculated?

Electric potential (V), or voltage, is the work done per unit charge. It is calculated using the formula V = W / Q, where 'W' is the work done and 'Q' is the charge. The unit is Volts (V).

What is Ohm's Law and how is it applied?

Ohm's Law states that the voltage (V) across a conductor is equal to the current (I) through it multiplied by the resistance (R). The formula is V = I × R, and the unit for voltage is Volts (V), for current is Amperes (A), and for resistance is Ohms (Ω).

How is resistance calculated for a material?

Resistance (R) of a material is calculated using the formula R = ρ × (L / A), where 'ρ' is the resistivity, 'L' is the length of the conductor, and 'A' is the cross-sectional area. The unit of resistance is Ohms (Ω).

What is the formula for calculating total resistance in a series circuit?

In a series circuit, the total resistance (R_S) is the sum of the individual resistances: R_S = R1 + R2 + R3 + ... The unit for resistance is Ohms (Ω).

How is total resistance calculated in a parallel circuit?

In a parallel circuit, the total resistance (R_P) is calculated using the formula 1 / R_P = 1 / R1 + 1 / R2 + 1 / R3 + ... The unit for resistance is Ohms (Ω).

What does Joule's Law of Heating describe and what is its formula?

Joule's Law of Heating states that the heat (H) produced in a conductor due to current is given by H = I² × R × t, where 'I' is the current, 'R' is the resistance, and 't' is time. The unit for heat is Joules (J).

What are the different formulas for calculating power?

Power (P) can be calculated in several ways: P = W / t (work done over time), P = V × I (voltage times current), P = I² × R (current squared times resistance), or P = V² / R (voltage squared divided by resistance). The unit of power is Watts (W).

How are heat and power related in electrical circuits?

Heat and power are related because the power formulas can be multiplied by time to give the amount of heat produced in the circuit. For example, multiplying P = I² × R by time (t) gives the heat formula H = I² × R × t.