The basics of Current
What is current measured in?
(A) Amps
(B) Volts
(C) Watts
(D) Ohms
(E) Newtons
(A) Amps
Which is a conductor?
(A) Wood
(B) Plastic
(C) Metal
(D) Rubber
(E) Glass
(C) Metal
Who discovered electrons?
(A) Newton
(B) Edison
(C) JJ Thomson
(D) Faraday
(E) Tesla
(C) JJ Thomson
Which instrument measures current?
(A) Voltmeter
(B) Thermometer
(C) Ammeter
(D) Compass
(E) Stopwatch
(C) Ammeter
Why do metals conduct electricity?
(A) Tightly packed atoms
(B) High density of atoms
(C) Free electrons
(D) They are good insulators of electricity
(E) They experience a Magnetic force
(C) Free electrons
Electricity is made of:
(A) Atoms
(B) Photons
(C) Electrons
(D) Neutrons
(E) Energy waves
(C) Electrons
Current carries what to components?
(A) Heat
(B) Light
(C) Energy
(D) Mass
(E) Force
(C) Energy
Which is an insulator?
(A) Copper
(B) Gold
(C) Rubber
(D) Iron
(E) Aluminium
(C) Rubber
Electricity flows through wires like:
(A) Light through glass
(B) Water in pipes
(C) Heat in metal
(D) Sound in air
(E) Air in lungs
(B) Water in pipes
What is current?
(A) Flow of energy
(B) Flow of charges
(C) Heat transfer
(D) Sound waves
(E) Gravity
(B) Flow of charges
What happens in insulators?
(A) Charges flow freely
(B) Charges are stuck
(C) Heat increases
(D) Current increases
(E) Circuit breaks
(B) Charges are stuck
What experiment led to electron discovery?
(A) Oil drop
(B) Cathode ray tube
(C) Falling apple
(D) Solar panel
(E) Circuit loop
(B) Cathode ray tube
If a circuit has more current, what happens?
(A) Brighter bulb
(B) Colder wires
(C) No change
(D) More resistance
(E) Slower current
(A) Brighter bulb
Which best explains why plastic is used around wires?
(A) Makes wires heavier
(B) Keeps current inside
(C) Prevents energy
(D) Makes wires move
(E) Makes electricity faster
(B) Keeps current inside
Why is JJ Thomson important to electricity?
(A) He invented wires
(B) He found protons
(C) He discovered charges move
(D) He built circuits
(E) He made magnets
(C) He discovered charges move