Electricity Flashcards
What units do we measure charge in?
Coulombs
What particles carries the charge in a circuit?
Electrons
Can conductors conduct electricity?
Yes
Can insulators conduct electricity?
No
What is a electrical current?
The rate of flow of charge (The amount of charge per second)
What are the units of current?
Amps (A)
What is used to measure current?
Ammeter
What is used to measure the potential difference?
Voltmeter
How do you connect an ammeter to a crcuit?
In series
How do you connect a voltmeter to a circuit?
In parallel
State the equation linking charge flow and current
Q = I x T
State the units for:
Charge
Current
Time
Coulombs (C)
Amps (A)
Seconds (s)
How does increasing the potential difference of a source affect the current in a circuit?
The higher the potential difference of the source (cell, or battery) the higher the current in the circuit
What is resistance?
Anything that slows the flow down
How does increasing the resistance in a circuit affect current?
The higher the resistance, the lower the current (for a given potential difference
What causes the resistance in a circuit?
Collisions between the electrons carrying charge and the positive metal ions vibrating in fixed positions
Explain how increasing the length of a wire affects its resistance.
· More ions in the wire
· So more collisions of electrons with ions
State one factor, other than length, that affects the resistance of a wire.
Thickness of the wire (Thinner the wire, the greater the resistance)
What equation link potential difference, current and resistance?
V = I x R
What are the units of resistance?
Ohms (Ω)
What are the units for Potential difference?
Volts (V)
