Current Flashcards
What is electrical current?
Electrical current is the flow of electrons around a closed circuit
What is current measured in?
Amps (A)
What are some rules for drawing circuits?
- circuits must be complete (no gaps)
- must be drawn with a pencil and a ruler
- wires are straight lines and do not cross
What is the equation used to calculate resistance?
V = I x R
(Voltage = Current x Resistance)
(T or F) Current flow can be positive or negative
True
What charge do electrons have - positive or negative?
Negative
What two things does a circuit need in order for current to flow?
- a source of voltage
- the circuit is complete
What are the two types of circuits?
Series & parallel circuit
In a series circuit what happens to the power of the current if there are more bulbs? Explain your answer.
The flow of current decreases because there is a larger resistance with more bulbs.
In a series circuit what happens to the power of the current if there are more cells? Explain your answer.
The power of the current increases because more energy is supplied from the increased amount of cells.
Current is the ………. in a series circuit.
same everywhere
Current ………. in a parallel circuit.
splits at junctions/is shared between branches
