current electricity

Question 1

what is electric current?

Answer 1

continuous movement of charge through a conductor where a cell provides energy for charges to move.

Question 2

what is need to move charge?

Answer 2

cell/Battery

pathway (closed conductor)

Question 3

what is conventional current?

Answer 3

movement of electrical charge from positive to negative terminals of cell

Question 4

what is current?

Answer 4

movement of electrical charge

Question 5

what is current strength?

Answer 5

the rate of movement of charge

Question 6

what is the formula to find current (I)?

Answer 6

current(I) = charge(Q) / time(t)

Question 7

what is time, current and charge measured in?

Answer 7

time (t) = seconds
charge (Q)- coulombs
current(I)= amperes

Question 8

What is an electrical circuit?

Answer 8

arraignment of components for charge to move through them

Question 9

what is a resistor?

Answer 9

semi conductor

Question 10

what is an ammeter?

Answer 10

measures strength of current

Question 11

what is a voltmeter?

Answer 11

measures voltage (in parallel) measures voltage between two points

Question 12

what has a low resistance?

Answer 12

ammeter

Question 13

what has a high resistance?

Answer 13

voltmeter - doesn’t allow current through

Question 14

what is voltage?

Answer 14

ability of a cell to transfer energy (work done)

Question 15

what does voltage cause

Answer 15

current to flow by being pushed from high potential difference to low potential difference in a cell

Question 16

formula for potential difference

Answer 16

Potential difference(V) = work done (W)/ charge (Q)

Question 17

what is Potential difference and work done measured in?

Answer 17

potencial diff (V)- volts (v)
work done(W)- joules (J)

Question 18

what does resistance do?

Answer 18

oppose/ resists movement of charge

Question 19

formula for resistance?

Answer 19

Resistance(R)= potential difference(V)/ current(I)

Question 20

what is resistance measured in?

Answer 20

Resistance(R)= Omhs Ω

Question 21

formula for calculating resistors in parallel?

Answer 21

1/R = 1/r1 + 1/r2

Question 22

formula for calculating resistors in series?

Answer 22

Rt= r1 + r2

Question 23

what are resistors in series?

Answer 23

potential dividers but current same

Question 24

what are resistors in parallel?

Answer 24

current dividers but potential difference the same

Question 25

how to measure the difference in current between different resistors in parallel?

Answer 25

1. inverse ratios for I ratios

2. use the formula: total I x ratio of I in x/y resistor/ total ratio sum