Electrical current depends on resistance and potential difference. Different electrical components have different characteristics. These can be investigated using suitable circuits and apparatus.
What is the definition of electric current?
Current is the rate of flow of charged particles
Current is how many charged particles there are
Current is the rate of flow of all particles
What is the formula for charge flow?
Charge flow (C) = current (A) × time (s)
Charge flow (C) = current (A) ÷ time (s)
Charge flow (C) = time (s) ÷ current (A)
When 10 C of charge flows for 0.01 s, what is the current?
What is the charge flow when a 5 mA torch is left on for 15 minutes?
What is the unit of resistance?
What happens to the resistance of a piece of resistance wire as it gets hotter?
Its resistance increases
Its resistance stays the same
Its resistance decreases
What does the current-voltage graph for a linear circuit component show?
A straight line passing through the origin, showing that current is directly proportional to potential difference
A curved line passing through the origin, showing that current is not directly proportional to potential difference
A straight line passing through the origin, showing that current is inversely proportional to potential difference
Which statement about thermistors is correct?
Their resistance decreases as the light intensity increases
Their resistance increases as the temperature increases
Their resistance decreases as the temperature increases
What is the current in a 100 Ω resistor with a potential difference of 5 V across it?
What is the job of a diode?
To convert ac to dc
To covert dc to ac
To increase in resistance when exposed to a temperature rise