Circuit — Science definition

Defined in 2 courses:

Where it is taught

In use

A simple direct-current circuit provides a complete conducting path through a source and components.

Electricity & Simple Circuits

Questions using circuit

Problem 1

Which statement correctly uses circuit in Simple Circuits: Paths, Switches & Energy?
  1. circuit: A connected path supporting charge flow and energy transfer under stated conditions.
  2. The lamp consumes the charge, leaving none in the return path.
  3. A picture of a closed circuit proves a real device is safe and functioning.
  4. One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation

circuit: A connected path supporting charge flow and energy transfer under stated conditions.

A connected path supporting charge flow and energy transfer under stated conditions. The parallel branch design provides the modeled independent control: opening A does not interrupt B’s complete path. The common switch can still stop both. The records do not establish equal brightness, battery lifetime, or a safe real construction; those require a rated design and further evidence.

Problem 2

A circuit has 9 volts and 3 ohms of resistance. Find the current.
Answer and explanation

3 A

I = V ÷ R = 9 ÷ 3 = 3 A.

Problem 3

A 15-volt circuit has a current of 5 amps. Find the resistance.
Answer and explanation

3 Ω

R = V ÷ I = 15 ÷ 5 = 3 Ω.

Problem 4

In a series circuit, if one bulb burns out…
  1. only that bulb goes out; the others stay lit
  2. all the bulbs go out because the circuit is broken
  3. the other bulbs get brighter
  4. nothing changes
Answer and explanation

all the bulbs go out because the circuit is broken

A series circuit has only one path, so a break anywhere stops current everywhere on that path.

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