Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. Name the two different types of circuit that can be used to join electrical components together?
   • There are two ways of joining electrical components, in series and in parallel. Some circuits include both series and parallel parts.
2. What do we use dc series circuits for?
   • dc series circuits are used for most electrical circuits as they need a continuous positive suppy of electricity, wecan measure the current, potential difference and resistance in a dc circuit, if a component in a dc circuit fails this acts like a switch to turn off the circuit.
3. What is created in the area around a charged object?
   • A charged object creates an electric field around itself.
4. Describe how: a) Current b) Potential difference c) Total resistance Varies between components connected in series.
   • For components connected in series: a) there is the same current through each component b) the total potential difference of the power supply is shared between the components c) The total resistance of two components is the sum of the resistance of each component. Rtotal = R1 R2
5. What is the current if the potential difference is 12V and the resistance is 4Ohms?
   • I = V/R so I = 12V /4ohms = 3A
6. Describe how: a) current b) potential difference c) total resistance varies between components connected in parallel circuits?
   • For components connected in parallel: a) the potential difference across each component is the same b) the total current through the whole circuit is the sum of the currents through the separate components c) the total resistance of two resistors is less than the resistance of the smallest individual resistor.
7. What happens when two electically charged objects are brought close together?
   • When two electrically charged objects are brought close together they exert a Force on each other.
8. In what two ways can Ohms law be applied to a circuit?
   • Either to a cirucit as a whole using equivalent resistence or to an individual component.
9. Why does adding resistors in series increase the total resistance, whilst adding resistors in parallel decreases the total resistance?
   • Adding resistors in parallel to a circuit results in the equivalent resistance of the circuit decreasing and the total current of the circuit increasing. Adding more resistors in parallel is equivalent to providing more branches through which charge can flow.