Electricity - Resistance, Power and Ohm's Law

Question 1

What is Resistance?

Answer 1

Resistance controls the current and it is inversely proportional to current (Ohm’s Law)
Resistance refers to the measure of obstacles in a a wire or an electrical appliance while charges move through it.

Reformed via AI - Resistance is the measure of obstacles encountered by electric charges as they move through a wire or an electrical appliance.

SI unit - Ohms

Question 2

Describe a series circuit. Mention how current travels, how voltage is distribute and how current is calculated and affected.

Answer 2

In a series circuit, there is a single path for current to travel.
Voltage is distributed among the resistors of the cell/battery.
Current remains the same

Total Resistance/Effective Resistance = R1 + R2

Question 3

Describe a parallel circuit. Mention how current travels, how voltage is distribute and how current is calculated and affected.

Answer 3

In a parallel circuit, there are branches for current to travel.
Voltage across point x (prior to the branches) and point y (at the end of the circuit) will remain the same.
Current divides

Total Resistance/Effective Resistance = 1/R1 + 1/R2 + …..

For 2 resistors = (R1R2)/(R1 + R2)

Question 4

What is power? Give its formula(s) and SI unit.

Answer 4

Power refers to energy per unit time.
Power refers to te physical quantity of energ measured or given out per unit time.

Formula(s) -
P = IV (determine power of a source/battery)
P = I^2R (Calculate power lost in a resistor due to hear
P = V^2/R

Symbol - P
SI Unit - Watts

Question 5

What is Ohm’s Law? State it’s formula.

Answer 5

Ohm’s law states that if voltage increases in a circuit, current must also increase. Current and voltage are directly proportional.

V = IR

Question 6

What are Ohmic conductors?

Answer 6

Ohmic materials/conductors are conductors/materials which abide by Ohms law.