The below circuit is a part of an electrical device. Use the information given in the question to calculate the following. (a) Potential Difference across R2. (b) Value of the resistance R2. (c) Value of resistance R1.

From the diagram, - Voltage of battery (V) = 12 V - Net current through the circuit (I) = 2.0 A - Current through 4 Ω resistor (i) = 1.5 A (a) As, 4 Ω and R2 are in parallel then the potential difference across them should be equal i.e., Potential difference across R2 = Potential difference across 4 Ω = i x 4 = 1.5 x 4 = 6.0 V Hence, the potential Difference across R2 is 6.0 V. (b) Now, Current through R2 = I - i = 2.0 - 1.5 = 0.5 A Then, Potential difference across R2 = (I - i) x R2 ⇒ (I - i) x R2 = 6 ⇒ 0.5 x R2 = 6 ⇒ R2 = ⇒ R2 = 12 Ω Hence, value of the resistance R2 is 12 Ω. (c) As, Potential drop across all series resistor = V ⇒ Potential drop across R1 + Potential drop across R2 + Potential drop across 2.0 Ω = 12 ⇒ I x R1 + 6 + I x 2 = 12 ⇒ 2 x R1 + 2 x 2 = 12 - 6 ⇒ 2 x R1 + 4 = 6 ⇒ 2 x R1 = 6 - 4 ⇒ 2 x R1 = 2 ⇒ R1 = ⇒ R1 = 1 Ω Hence, value of resistance R1 is 1 Ω.

The image below shows a developing fetus in the mother's womb. The developing fetus is connected to the placenta by means of umbilical cord. The Umbilical vein and artery run inside the umbilical cord.
(a) Name two substance that moves through the blood vessels.
(b) If the placenta has less villi how will it affect the baby’s growth?
(c) Name the region where the embryo develops inside the female body. Explain how this region is adapted for nourishing the baby.
(d) Some of the fetal cells fall off into the amniotic fluid and can be collected by careful procedure. The cells were screened and found to contain XY chromosome.
(i) What is the sex of the foetus?
(ii) How is this prenatal sex determination misused?

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A developing fetus is connected to the placenta by means of umbilical cord. The Umbilical vein and artery run inside the umbilical cord.
(a) Name two substance that moves through the blood vessels.
(b) If the placenta has less villi how will it affect the baby’s growth?
(c) Name the region where the embryo develops inside the female body. Explain how this region is adapted for nourishing the baby.
(d) Some of the fetal cells fall off into the amniotic fluid and can be collected by careful procedure. The cells were screened and found to contain XY chromosome.
(i) What is the sex of the foetus?
(ii) How is this prenatal sex determination misused?

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(a) State the law and write the formula connecting the electric current flowing through a conductor and voltage applied across it.
(b) In a household five fans each of 100 W are used for 4 hours and an electric press of 500 W for 2 hours every day. Calculate the cost of using the fans and electric press for 60 days if the cost of 1 unit of electrical energy is Rs. 6.5

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As shown in the figure below A and B are two lamps. Lamp A is rated at 12 V, 24W. Lamp B is rated at 6.0 V. When lamp B operates at its rated voltage, the current in it is 3.0 A. The values of R₁ and R₂ are chosen so that both lamps operate at their rated voltages.
Based on the information given, answer the following.
(a) Calculate the current in Lamp A.
(b) State and give reason for the reading of the Voltmeter.
(c) Calculate the resistance of R₂.
(d) Find the value of the resistance R₁.

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Science

The below circuit is a part of an electrical device. Use the information given in the question to calculate the following.
(a) Potential Difference across R₂.
(b) Value of the resistance R₂.
(c) Value of resistance R₁.

Current Electricity

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Science

The below circuit is a part of an electrical device. Use the information given in the question to calculate the following.(a) Potential Difference across R2.(b) Value of the resistance R2.(c) Value of resistance R1.

Current Electricity

Related Questions

The below circuit is a part of an electrical device. Use the information given in the question to calculate the following.
(a) Potential Difference across R₂.
(b) Value of the resistance R₂.
(c) Value of resistance R₁.