Yr 9 Electricity

What is needed for electrical charge to flow through a closed circuit?

• Resistance

• Power

• Energy

• Voltage

At any point in a single closed loop, the current is

• The same

• twice as much at the end as it was at the beginning

• half as much at the end as it was at the beginning

• Divided between components

The current through any component depends on

• The energy and charge

• The power and time

• The voltage and resistance

• The capacitance and voltage

What is resistance measured in?

• Volts

• Ohms

• Amperes

• Joules

What is an ohmic conductor?

• A conductor in which power is proportional to voltage at a given temperature

• An insulator in which current is proportional to voltage at a given temperature

• A conductor in which current is proportional to voltage at a given temperature

• An insulator in which power is proportional to charge at a given temperature

Describe current flow in a diode

• Current flows in only the same direction the diode is pointing

• Current flows in only the opposite direction that the diode is pointing

• Current doubles in the direction that the diode is pointing

• Current doubles in the opposite direction that the diode is pointing

Describe the function of an LDR

• It increases the resistance as light intensity increases.

• It decreases the resistance as light intensity increases.

• It only allows current to flow in one direction

• It allows current to flow in one direction if light intensity decreases.

What current flows in both directions and who was it discovered by?

• DC-Edison

• DC- Tesla

• AC- Edison

• AC- Tesla

What is a transformer?

• Increases and decreases the voltage and current

• Increases and decreases the power and time

• Increases and decreases the charge and energy

• Increases and decreases the resistance and charge

What is an electric field?

• The area around an appliance where you can feel electricity

• The area around an appliance where you can see electricity

• The area around an appliance where a charged particle experiences a force

• The area around an appliance where you could be potentially harmed by an electric shock.