Question

Q19. When a resistor is placed across 230M supply (de) the

Answer 1

The value of the resistor that must be connected in parallel is 57.47 ohms

How to determine the resistor connected across the 230 V supply

• Voltage (V) = 230 V
• Current (I) = 12 A
• Resistor 1 (R₁) =?

V = IR

230 = 12 × R₁

Divide both sides by 12

R₁ = 230 / 12

R₁ = 19.17 ohms

How to determine the total resistance

• Voltage (V) = 230 V
• Current (I) = 16 A
• Total resistance (Rₜ) =?

V = IR

230 = 16 × Rₜ

Divide both sides by 12

Rₜ = 230 / 16

Rₜ = 14.375 ohms

How to determine the resistor connected in paralle

• Resistor 1 (R₁) = 19.17 ohms
• Total resistance (Rₜ) = 14.375 ohms
• Resistor 2 (R₂) = ?

1/Rₜ = 1/R₁ + 1/R₂

Collect like terms

1/R₂ = 1/Rₜ - 1/R₁

R₂ = (Rₜ × R₁) / (R₁ - Rₜ)

R₂ = (14.375 × 19.17) / (19.17 - 14.375)

R₂ = 57.47 ohms

Learn more about Ohm's law:

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