P5 0.0 / 5 ? PhysicsElectricityGCSEOCR Created by: CENCreated on: 04-12-16 11:16 In a series circuit, does a 2nd resistor reduce or increase the number of charges that cross? Reduce, however in parallel circits a second resistor would increase the charges 1 of 23 What charge does a proton have? +'ve 2 of 23 Can you rub off the 'cloud' of electrons around the nucleus? Yes, they can be transffered to other materials creating static electricity 3 of 23 If electrons flow then a ... is produced. Current 4 of 23 True or false? The charges in a circuit are in the battery. False, they're all the way around the circuit, the battery pushes them about 5 of 23 What do you do to work out the voltage across the battery with two bulbs in a series circuit? V1 = V2 + V3 6 of 23 In parallel circuits the voltage is same across the circuit. T or F? T, V1 = V2 = V3 7 of 23 What happens when you increase the resistance in a series circuit? parallel? Series-it increases (total=R1+R2). Parallel-gets smaller (1/RT = 1/R2 +1/R1). 8 of 23 Is current used up in a circuit? No, current is pushed through the components. 9 of 23 V=? V=IR 10 of 23 The voltage of a battery can be thought of as what? The push it exerts on the charges. 11 of 23 Does the voltage depend on th chemicals in the battery? Yes 12 of 23 What is resistance measured in? Ohms 13 of 23 Connecting leads don't have resistance, that's why they're used. T or F? F, EVERYTHING has resistance! Connecting leads have little resistance, that's why they're used 14 of 23 Does increasing resistance increase temperature? Yes- higher voltage, more collisions, vibrates more, increased temperature, (glows) 15 of 23 What did Faraday discover? That moving a magnet in and out of a coil of wire a current was induced AKA electricity 16 of 23 How do you increases potential difference? Stronger magnet, rotate magnet faster, increase number of coils on the wire, iron core (x1000 current) 17 of 23 What does a current flowing in a wire create? A magnetic field 18 of 23 Explain Fleming's Left-Hand Rule Thumb-thrust, first finger, field, second finger-current 19 of 23 Define power Power-rate at which energy is transfered from the battery to the environment via a component 20 of 23 P (watts) = ? I (amps) x V (volts) 21 of 23 Work done (joules) = ? Power (watts) x time (seconds) 22 of 23 Coil B has more turns than coil A, therefore this is a ... transformer Step-up 23 of 23
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