Current, Potential Difference & ResistanceEdexcel IGCSE Physics: Flashcards
Card 1 of 130 of 13 known
Question
What is the unit of current?
Tap or press Space to reveal
Tap card or press Space to flip
See all 13 cards
- What is the unit of current?
- The ampere (A).
- What is the unit of charge?
- The coulomb (C).
- What is the unit of resistance?
- The ohm (Ω).
- Define current.
- The rate of flow of electric charge.
- What carries current in a solid metallic conductor?
- A flow of negatively charged electrons.
- State the equation linking charge, current and time.
- Q = I × t.
- Define voltage (potential difference).
- The energy transferred per unit charge passed; 1 volt = 1 joule per coulomb.
- State the equation linking energy transferred, charge and voltage.
- E = Q × V.
- State the equation linking voltage, current and resistance.
- V = I × R.
- What happens to current at a junction in a circuit?
- It is conserved — total current entering equals total current leaving.
- How does voltage compare across components connected in parallel?
- It is the same across each parallel component.
- In a series circuit with two resistors, how does the current compare through each?
- The current is the same through each component.
- Calculate the charge that flows when a current of 3 A flows for 10 s.
- Q = I × t = 3 × 10 = 30 C.