Current and circuit symbols

Question 1

What is current ?

Answer 1

Electric current = flow of electrical charge. Electrical current will flow round complete circuit if there is PD, so current flows if source of PD. Unit of current is ampere, A

In a single, closed loop the current has the same value everywhere in the circuit.

Question 2

What is potential difference ?

Answer 2

Driving force that pushes the charge round. The unit is the volt, V

Question 3

What is resistance ?

Answer 3

Anything that slows the flow down (of current). Unit is ohms Ω

Question 4

The current flowing through a component depends on 2 things

Answer 4

• pd across it
• resistance of component

Question 5

Greater the resistance across a component ..

Answer 5

the smaller the current that flows ( for given pd)

Question 6

What is the size of current ?

Answer 6

the rate of flow of charge.

Question 7

When current flows past a point in a circuit for a length of time then the charge that has passes is given by this formula:

Answer 7

Charge (c) Q=I (current A) T (s)

More charge passes around the circuit when a larger current flows

Question 8

https://quizlet.com/gb/643678538/circuit-diagram-symbols-flash-cards/?i=665z0l&x=1jqt