RPA Science IV Characteristics RP

What is the purpose of using a voltmeter and an ammeter in the circuit?

• To measure the potential difference and current across the resistor

• To measure the potential difference and current across the battery

• To measure the potential difference and current across the voltmeter

• To measure the potential difference and current across the ammeter

What does a straight line passing through 0 on the graph indicate?

• The potential difference is directly proportional to the current

• The potential difference is inversely proportional to the current

• The potential difference has no effect on the current

• The potential difference and current are not related

Why is it important to keep the temperature of the resistor constant?

• To ensure the graph has a straight line passing through 0

• To prevent damage to the circuit components

• To increase the resistance of the resistor

• To decrease the resistance of the resistor

What happens to the resistance of a filament lamp as the current increases?

• The resistance decreases

• The resistance remains constant

• The resistance increases

• The resistance becomes zero

Why does the graph for a filament lamp not show a straight line passing through 0?

• The potential difference is not directly proportional to the current

• The potential difference is inversely proportional to the current

• The potential difference has no effect on the current

• The potential difference and current are not related

What happens to the resistance of a diode in the reverse direction?

• The resistance decreases

• The resistance remains constant

• The resistance increases

• The resistance becomes zero

What is the purpose of the extra resistor in the circuit with a diode?

• To increase the current through the diode

• To decrease the current through the diode

• To protect the diode from high current

• To measure the potential difference across the diode

What happens to the current in a diode as the potential difference increases beyond the conducting threshold?

• The current decreases

• The current remains constant

• The current increases

• The current becomes zero

What happens to the current in a diode when the potential difference is reversed?

• The current decreases

• The current remains constant

• The current increases

• The current becomes zero

What is the purpose of an ammeter in the circuit with a diode?

• To measure the potential difference across the diode

• To measure the current through the diode

• To protect the diode from high current

• To increase the current through the diode