Understanding Voltage and Current in Circuits LG3

What is the main role of voltage in an electric circuit?

• To measure the speed of electrons

• To act as the energy source that pushes charges through the circuit

• To count the number of electrons

• To stop the flow of current

What does electric current represent in a circuit?

• The amount of energy stored

• The flow of electric charge

• The resistance to flow

• The brightness of a light bulb

Which unit is used to measure voltage in Australia?

• Amperes

• Volts

• Ohms

• Watts

Which unit is used to measure electric current?

• Volts

• Amperes

• Ohms

• Joules

If a battery provides a higher voltage, what effect does it have on the circuit (assuming resistance stays the same)?

• The current decreases

• The current increases

• The resistance increases

• The circuit stops working

What is the symbol for current in equations?

What is the symbol for voltage in equations?

Which of the following best describes the relationship between voltage, current, and resistance in a circuit?

• 7 V

• 10 V

• 2.5 V

• 0.4 V

What does a higher current in a circuit mean?

• More charge is flowing per second

• Less energy is used

• The voltage is always lower

• The resistance is zero