Potential Difference and Circuits

What is another name for potential difference?

• Voltage

• Current

• Resistance

• Power

What is the unit for measuring potential difference?

• Volts

• Amperes

• Ohms

• Watts

What does the potential difference also tell you about energy?

• How much energy can be transferred to the components in the circuit by the charges

• How much energy is lost as heat

• How much energy is stored in the battery

• How much energy is used by the wires

Why might a doctor use a defibrillator?

• To start someone's heart if it stops

• To measure blood pressure

• To check temperature

• To give medicine

Where do you connect a voltmeter to measure potential difference in a circuit?

• Either side of the component

• In series with the component

• Only at the battery

• Only at the switch

What does a voltmeter measure in a circuit?

• The size of the drop in potential difference

• The current flowing through the circuit

• The resistance of the circuit

• The power used by the circuit

What happens to the current if another cell is added to a circuit with a cell, an ammeter, and a buzzer?

• The current increases

• The current decreases

• The current stays the same

• The circuit breaks

What would happen if one of the cells in a circuit is turned around?

• The current may decrease or stop

• The current increases

• The bulb gets brighter

• The voltmeter explodes

What does the rating on a bulb tell you?

• The potential difference at which it is designed to work

• The current it can handle

• The resistance of the bulb

• The power it uses