Resistance and Ohm's Law (Leaving Cert Physics): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
ShowHide
Practise the questions
12 questions from this quiz
What happens to energy when electrons collide with atoms in a conductor?
What happens to energy when electrons collide with atoms in a conductor?
It appears as heat
What does a large ratio indicate about a conductor?
What does a large ratio indicate about a conductor?
High resistance
What is the formula for resistance?
What is the formula for resistance?
A conductor has 1 ohm resistance when 1 volt causes what current through it?
A conductor has 1 ohm resistance when 1 volt causes what current through it?
1 ampere
Which method requires calculating to find resistance?
Which method requires calculating to find resistance?
Ammeter and voltmeter
What advantage does an ohmmeter provide?
What advantage does an ohmmeter provide?
Direct resistance reading
What is the circuit symbol for a fixed resistor?
What is the circuit symbol for a fixed resistor?
Rectangular box
What distinguishes a variable resistor from a fixed resistor?
What distinguishes a variable resistor from a fixed resistor?
Resistance can be changed
How does a rheostat change resistance?
How does a rheostat change resistance?
Sliding contact changes wire length
What condition is essential for Ohm's Law to apply?
What condition is essential for Ohm's Law to apply?
Constant temperature
What does Ohm's Law state about current and potential difference?
What does Ohm's Law state about current and potential difference?
Current is proportional to voltage
What is the resistance if current is 4 A and potential difference is 20 V?
What is the resistance if current is 4 A and potential difference is 20 V?
5 Ω