Physics flashcards
Voltmeter: measures….
Voltmeter: measures the potential difference (V).
What is the unit for resistance?
Ohms
What moves in wires to give a current?
Electrons
What is the unit for current?
A (amps)
Which metals are magnetic?
iron, nickel, cobalt and steel
Whats another device that can measure current?
multimeter
Where will the magnetic field of the Earth be the strongest?
The poles
What do we use to measure current
ammeter
What provides energy for electrons to movie in a wire to give a current?
cell or battery
How does adding extra bulbs affect the resistance?
it increases the resistance
What is transferred when a static charge is created?
Electrons
When a resistance is high, what happens to the current?
A) The current increases
B) The current decreases
B) The current decreases
How do the field lines tell you the strength of a magnet?
A) Closer the field lines are the stronger the magnet.
B) The more far away the field lines are the stronger the magnet.
A) Closer the field lines are the stronger the magnet.
Does current flow from positive to negative terminal or negative to positive terminal?
negative to positive
what do we measure potential difference in?
a: amps
b :joules
c: volts
c; we measure potential difference in volts
Whats the calculation for resistance?
Resistance (Ω) = potential difference (V) ÷ current (A)
what year was electricity discovered?
HEY ANANYA :))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))0
whats ohms law?
The current that flows through it is directly proportional to the potential difference.
This means if you double the potential difference the current will also double.
what charge do neutrons have?
NONE they’re neutral hahahahahaha
what charge do electrons have?
electrons have a NEGATIVE charge
What charge do protons have?
NONE they’re neutral hahahahahahaha
no u dummy they have a positive charge
What happens when an atom looses an electron?
a: becomes positively charged
b: becomes neutral
c: becomes negatively charged
a: the atom becomes positively charged
{so if it gains an electron it becomes negatively charged because electrons have a negative charge}
Do two oppositely charged particles attract or repel?
ATTRACT
What is static electricity caused by?
Static electricity is caused by negatively charged electrons jumping from one material to another.
When you rub two insulating materials together, one substance will lose electrons the other will gain electrons.
If you rub a cloth on a plastic rod the cloth will rub off electrons. If this happens:
The cloth will gain electrons and so become negatively charged.
The plastic rod will lose electrons and so become positively charged.
This is why a balloon will stick to the wall after you have rubbed it on your head.
