Electrical circuit

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Across
  1. 4. Bulb I shine bright when the switch takes flight. What am I, dispelling the dark with light?
  2. 5. I'm the flow of charge, electrons on parade. What am I, in circuits, a dynamic cascade?
Down
  1. 1. In a cell, I store power in a compact form. What am I, providing energy in a swarm?
  2. 2. I'm a gatekeeper of current, with a simple line, My symbol resembles a vertical bar, controlling the shine.
  3. 3. Current I flow in a circuit, a charge on the move, A spark of energy, in me, you'll groove.