ATS Y9 Physics Exam (Summer)

How do you calcluate the efficiency of a device?

• useful energy output / total energy input

• wasted energy output / total energy input

• total energy x useful energy

• wasted energy x total energy

A television, transfers electrical energy into light, sound and heat. Which one of these is wasted energy?

• light

• sound

• heat

• electrical

What is the correct equation for calcluating kinetic energy?

• mass x velocity

• 0.5 x mass x velocity²

• mass / velocity

• mass / velocity²

How is energy transferred in solids?

• conduction

• convection

• radiation

What is this symbol?

• cell

• bulb

• diode

• resistor

If a cell had a voltage of 1.5V, how many would you need to made 6V?

• 2

• 3

• 4

• 5

Which energy resource will eventually run out?

• solar

• wind

• waves

• gas

What equation links volatge, current and resistance?

• V = RI

• V = IR

• V = I/R

• V = R/I

Potential difference is another way of describing...

• current

• resistance

• volatge

What are the units for current?

• amps (A)

• volts (V)

• ohms (Ω)