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● V = IR [Ohm's law]

● Rₙₑₜ = R₁ + R₂ ..... + Rₙ [Series Connection]

● 1/Rₙₑₜ = 1/R₁ + 1/R₂ ..... + 1/Rₙ

[Parallel Connection]

✭ Series Connection :

Both these connection are separated into two series and parallel connection. First two 4 Ω resistance in series and these are connected in parallel

→ R(eq) = R₁ + R₂ ..... + Rₙ

→ R(eq) = 4 + 4

→ R(eq) = 8 Ω

✭ Parallel Connection :

→ 1/Rₙₑₜ = 1/R₁ + 1/R₂ ..... + 1/Rₙ

→ 1/Rₙₑₜ = 1/8 + 1/8

→ 1/Rₙₑₜ = (1+1)/8

→ 1/Rₙₑₜ = 2/8

→ Rₙₑₜ = 8/2

→ Rₙₑₜ = 4Ω

✭ Current when the key is closed :

→ V = IR

→ 2 = I × 4

→ 2/4 = I

→ Current = 0.5 A

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When the key is open then there would be no current, that is Current = 0 A

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.