# Physics 1

what are the two types of electric charge?q
positive and negative charge
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what is the charge of electrons?
negative charge
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what is the charge on protons
positive charge
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what is the charge on neutrons?
no charge
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what charge moves from object to object?
electrons, negative charge
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what types of field do you have around a charge?
electric field
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what is current?
it is the amount of charge flowing per second
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what is current measured in?
amps
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what is current measured with?
ammeter
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what pushes the charge round the circuit?
the cell or battery
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what does the battery push but no create?
charge
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what model could you make to represent a circuit?
two people holding a rope, one person pulls the rope and the other person grips the rope tightly
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what is p.d. short for?
potential difference
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what is potential difference?
the push the cell or battery provides
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what can the potential difference tell you?
how much energy can be transferred to the components
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what does a voltmeter measure?
potential difference
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what is potential difference measured in?
volts
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what is a series circuit?
a circuit that has one loop (including bulbs, battery and switch)
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what is a parallel circuit?
a circuit that has more than one loop
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what is the current like in a series circuit?
the current is the same anywhere
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what will happen to the current in a series circuit if you add more components?
the current will get small
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what is the current like in a parallel circuit?
the current in the branches is the same and the ammeter on the outer loop shows the total current
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what will happen to the current if you add another branch to a parallel circuit?
the current in the branches will stay the same but the total current will increase
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what happens to the p.d. in series circuits?
the p.d. across each component adds up to the p.d. across the battery
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what happens to the p.d. in a parallel circuit?
the p.d. across each component is the same as the p.d. across the battery
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what is resistance?
it is how easy or difficult it is for the charges to pass through the component
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what is resistance measured in?
ohms
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how can you calculate the current using the p.d. and resistance?
divide the p.d. by the resistance
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how can you calculate the resistance using the p.d. and current?
divide the p.d. by the current
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conductor have very low what?
resistance
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insulator have high what?
resistance
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what objects have a force on in a magnetic field?
a magnet or magnetic material
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what direction do magnetic field lines go in?
from north pole to south pole
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what does it mean if magnetic field lines are closer together?
the magnetic field is stronger
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what is a permanent magnet?
a magnet that has its own magnetic field
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what is an electromagnet?
a magnet that can be turn on and off and can be made a lot stronger than permanent magnets
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what is the material used as a core in an electromagnet?
iron but steel is better
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how can you make an electromagnet stronger?
adding more turns or loops on the coil, adding more current and using a better/stronger core
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what are some examples of where we use electromagnets in everyday life?
some trains, when starting a car, lifting a car
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## Other cards in this set

### Card 2

#### Front

what is the charge of electrons?

negative charge

### Card 3

#### Front

what is the charge on protons

### Card 4

#### Front

what is the charge on neutrons?

### Card 5

#### Front

what charge moves from object to object?